diff --git a/components/compositing/constellation.rs b/components/compositing/constellation.rs
index edc19ce07a5..5f6a1f6527f 100644
--- a/components/compositing/constellation.rs
+++ b/components/compositing/constellation.rs
@@ -475,9 +475,9 @@ impl<LTF: LayoutTaskFactory, STF: ScriptTaskFactory> Constellation<LTF, STF> {
                 debug!("constellation got get root pipeline message");
                 self.handle_get_pipeline(frame_id, resp_chan);
             }
-            ConstellationMsg::GetFrame(parent_pipeline_id, subpage_id, resp_chan) => {
+            ConstellationMsg::GetFrame(pipeline_id, resp_chan) => {
                 debug!("constellation got get root pipeline message");
-                self.handle_get_frame(parent_pipeline_id, subpage_id, resp_chan);
+                self.handle_get_frame(pipeline_id, resp_chan);
             }
             ConstellationMsg::Focus(pipeline_id) => {
                 debug!("constellation got focus message");
@@ -919,11 +919,9 @@ impl<LTF: LayoutTaskFactory, STF: ScriptTaskFactory> Constellation<LTF, STF> {
     }
 
     fn handle_get_frame(&mut self,
-                        containing_pipeline_id: PipelineId,
-                        subpage_id: SubpageId,
+                        pipeline_id: PipelineId,
                         resp_chan: IpcSender<Option<FrameId>>) {
-        let frame_id = self.subpage_map.get(&(containing_pipeline_id, subpage_id)).and_then(
-            |x| self.pipeline_to_frame_map.get(&x)).map(|x| *x);
+        let frame_id = self.pipeline_to_frame_map.get(&pipeline_id).map(|x| *x);
         resp_chan.send(frame_id).unwrap();
     }
 
diff --git a/components/msg/constellation_msg.rs b/components/msg/constellation_msg.rs
index a594a4078e9..98fdcc052fb 100644
--- a/components/msg/constellation_msg.rs
+++ b/components/msg/constellation_msg.rs
@@ -260,8 +260,8 @@ pub enum Msg {
     /// id, or for the root frame if this is None, over a provided channel
     GetPipeline(Option<FrameId>, IpcSender<Option<PipelineId>>),
     /// Request that the constellation send the FrameId corresponding to the document
-    /// with the provided parent pipeline id and subpage id
-    GetFrame(PipelineId, SubpageId, IpcSender<Option<FrameId>>),
+    /// with the provided pipeline id
+    GetFrame(PipelineId, IpcSender<Option<FrameId>>),
     /// Notifies the constellation that this frame has received focus.
     Focus(PipelineId),
     /// Requests that the constellation retrieve the current contents of the clipboard
diff --git a/components/msg/webdriver_msg.rs b/components/msg/webdriver_msg.rs
index db0fccac228..63ac4aa7ffd 100644
--- a/components/msg/webdriver_msg.rs
+++ b/components/msg/webdriver_msg.rs
@@ -2,7 +2,7 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
-use constellation_msg::{PipelineId, SubpageId};
+use constellation_msg::PipelineId;
 use ipc_channel::ipc::IpcSender;
 use rustc_serialize::json::{Json, ToJson};
 use url::Url;
@@ -16,7 +16,7 @@ pub enum WebDriverScriptCommand {
     GetActiveElement(IpcSender<Option<String>>),
     GetElementTagName(String, IpcSender<Result<String, ()>>),
     GetElementText(String, IpcSender<Result<String, ()>>),
-    GetFrameId(WebDriverFrameId, IpcSender<Result<Option<(PipelineId, SubpageId)>, ()>>),
+    GetFrameId(WebDriverFrameId, IpcSender<Result<Option<PipelineId>, ()>>),
     GetUrl(IpcSender<Url>),
     GetTitle(IpcSender<String>)
 }
diff --git a/components/script/webdriver_handlers.rs b/components/script/webdriver_handlers.rs
index 15b31ff63e7..c48240d5d9d 100644
--- a/components/script/webdriver_handlers.rs
+++ b/components/script/webdriver_handlers.rs
@@ -17,7 +17,7 @@ use ipc_channel::ipc::IpcSender;
 use js::jsapi::JSContext;
 use js::jsapi::{HandleValue, RootedValue};
 use js::jsval::UndefinedValue;
-use msg::constellation_msg::{PipelineId, SubpageId};
+use msg::constellation_msg::PipelineId;
 use msg::webdriver_msg::{WebDriverFrameId, WebDriverJSError, WebDriverJSResult, WebDriverJSValue};
 use page::Page;
 use script_task::get_page;
@@ -85,7 +85,7 @@ pub fn handle_execute_async_script(page: &Rc<Page>,
 pub fn handle_get_frame_id(page: &Rc<Page>,
                            pipeline: PipelineId,
                            webdriver_frame_id: WebDriverFrameId,
-                           reply: IpcSender<Result<Option<(PipelineId, SubpageId)>, ()>>) {
+                           reply: IpcSender<Result<Option<PipelineId>, ()>>) {
     let window = match webdriver_frame_id {
         WebDriverFrameId::Short(_) => {
             // This isn't supported yet
@@ -108,7 +108,7 @@ pub fn handle_get_frame_id(page: &Rc<Page>,
         }
     };
 
-    let frame_id = window.map(|x| x.and_then(|x| x.r().parent_info()));
+    let frame_id = window.map(|x| x.map(|x| x.r().pipeline()));
     reply.send(frame_id).unwrap()
 }
 
diff --git a/components/webdriver_server/lib.rs b/components/webdriver_server/lib.rs
index 329ba90422c..bb3019582d0 100644
--- a/components/webdriver_server/lib.rs
+++ b/components/webdriver_server/lib.rs
@@ -451,10 +451,10 @@ impl Handler {
         }
 
         let frame = match receiver.recv().unwrap() {
-            Ok(Some((pipeline_id, subpage_id))) => {
+            Ok(Some(pipeline_id)) => {
                 let (sender, receiver) = ipc::channel().unwrap();
                 let ConstellationChan(ref const_chan) = self.constellation_chan;
-                const_chan.send(ConstellationMsg::GetFrame(pipeline_id, subpage_id, sender)).unwrap();
+                const_chan.send(ConstellationMsg::GetFrame(pipeline_id, sender)).unwrap();
                 receiver.recv().unwrap()
             },
             Ok(None) => None,