Remove helper traits

Now that JSRef<T> is gone, there is no need to have helper traits.

On components/script/*.rs:

    # Remove imports.
    /^ *use dom::[a-z]+::\{.*Helpers/ {
        s/\{(Raw[^L]|[^L][^a])[a-zA-Z]+Helpers, /\{/
        s/, (Raw[^L]|[^L][^a])[a-zA-Z]+Helpers([,}])/\2/g
        s/\{([a-zA-Z]+)\}/\1/
        /\{\}/d
        s/::self;$/;/
    }
    /^ *use dom::[a-z]+::\{?(Raw[^L]|[^L][^a])[a-zA-Z]+Helpers\}?;$/d

On components/script/dom/*.rs:

    # Ignore layout things.
    /^(pub )?(impl|trait).*Layout.* \{/,/^}$/ { P; D; }

    # Delete helpers traits.
    /^(pub )?trait ([^L][^ ]|L[^a])[^ ]+Helpers(<'a>)? \{$/,/^\}$/D

    # Patch private helpers.
    /^impl.*Private.*Helpers/,/^\}$/ {
        s/^impl<'a> Private([^L][^ ]|L[^a])[^ ]+Helpers(<'a>)? for &'a ([^ ]+) \{$/impl \3 {/
        /^ *(unsafe )?fn .*\(self.*[<&]'a/ {
            s/&'a /\&/g
            s/<'a, /</g
        }
        /^ *(unsafe )?fn /s/\(self([,)])/\(\&self\1/
    }

    # Patch public helpers.
    /^impl.*Helpers/,/^\}$/ {
        s/^impl(<'a>)? ([^L][^ ]|L[^a])[^ ]+Helpers(<'a>)? for (&'a )?([^ ]+) \{$/impl \5 {/
        /^ *(unsafe )?fn .*\(self.*[<&]'a/ {
            s/&'a /\&/g
            s/<'a, /</g
        }
        /^ *(unsafe )?fn .*\(&?self[,)]/s/(unsafe )?fn/pub &/
        /^ *pub (unsafe )?fn /s/\(self([,)])/\(\&self\1/
    }

The few error cases were then fixed by hand.

components/script/dom/dedicatedworkerglobalscope.rs

@@ -17,10 +17,10 @@ use dom::bindings::refcounted::LiveDOMReferences;
 use dom::bindings::structuredclone::StructuredCloneData;
 use dom::bindings::utils::Reflectable;
 use dom::errorevent::ErrorEvent;
-use dom::eventtarget::{EventTarget, EventTargetHelpers, EventTargetTypeId};
+use dom::eventtarget::{EventTarget, EventTargetTypeId};
 use dom::messageevent::MessageEvent;
 use dom::worker::{TrustedWorkerAddress, WorkerMessageHandler, WorkerEventHandler, WorkerErrorHandler};
-use dom::workerglobalscope::{WorkerGlobalScope, WorkerGlobalScopeHelpers};
+use dom::workerglobalscope::WorkerGlobalScope;
 use dom::workerglobalscope::{WorkerGlobalScopeTypeId, WorkerGlobalScopeInit};
 use script_task::{ScriptTask, ScriptChan, TimerSource, ScriptPort, StackRootTLS, CommonScriptMsg};
 
@@ -245,26 +245,20 @@ impl DedicatedWorkerGlobalScope {
     }
 }
 
-pub trait DedicatedWorkerGlobalScopeHelpers {
-    fn script_chan(self) -> Box<ScriptChan + Send>;
-    fn pipeline(self) -> PipelineId;
-    fn new_script_pair(self) -> (Box<ScriptChan + Send>, Box<ScriptPort + Send>);
-    fn process_event(self, msg: CommonScriptMsg);
-}
 
-impl<'a> DedicatedWorkerGlobalScopeHelpers for &'a DedicatedWorkerGlobalScope {
-    fn script_chan(self) -> Box<ScriptChan + Send> {
+impl DedicatedWorkerGlobalScope {
+    pub fn script_chan(&self) -> Box<ScriptChan + Send> {
         box WorkerThreadWorkerChan {
             sender: self.own_sender.clone(),
             worker: self.worker.borrow().as_ref().unwrap().clone(),
         }
     }
 
-    fn pipeline(self) -> PipelineId {
+    pub fn pipeline(&self) -> PipelineId {
         self.id
     }
 
-    fn new_script_pair(self) -> (Box<ScriptChan + Send>, Box<ScriptPort + Send>) {
+    pub fn new_script_pair(&self) -> (Box<ScriptChan + Send>, Box<ScriptPort + Send>) {
         let (tx, rx) = channel();
         let chan = box SendableWorkerScriptChan {
             sender: tx,
@@ -273,21 +267,15 @@ impl<'a> DedicatedWorkerGlobalScopeHelpers for &'a DedicatedWorkerGlobalScope {
         (chan, box rx)
     }
 
-    fn process_event(self, msg: CommonScriptMsg) {
+    pub fn process_event(&self, msg: CommonScriptMsg) {
         self.handle_script_event(WorkerScriptMsg::Common(msg));
     }
 }
 
-trait PrivateDedicatedWorkerGlobalScopeHelpers {
-    fn handle_script_event(self, msg: WorkerScriptMsg);
-    fn dispatch_error_to_worker(self, &ErrorEvent);
-    fn receive_event(self) -> Result<MixedMessage, RecvError>;
-    fn handle_event(self, event: MixedMessage);
-}
 
-impl<'a> PrivateDedicatedWorkerGlobalScopeHelpers for &'a DedicatedWorkerGlobalScope {
+impl DedicatedWorkerGlobalScope {
     #[allow(unsafe_code)]
-    fn receive_event(self) -> Result<MixedMessage, RecvError> {
+    fn receive_event(&self) -> Result<MixedMessage, RecvError> {
         let scope = WorkerGlobalScopeCast::from_ref(self);
         let worker_port = &self.receiver;
         let devtools_port = scope.from_devtools_receiver();
@@ -311,7 +299,7 @@ impl<'a> PrivateDedicatedWorkerGlobalScopeHelpers for &'a DedicatedWorkerGlobalS
         }
     }
 
-    fn handle_script_event(self, msg: WorkerScriptMsg) {
+    fn handle_script_event(&self, msg: WorkerScriptMsg) {
         match msg {
             WorkerScriptMsg::DOMMessage(data) => {
                 let scope = WorkerGlobalScopeCast::from_ref(self);
@@ -346,7 +334,7 @@ impl<'a> PrivateDedicatedWorkerGlobalScopeHelpers for &'a DedicatedWorkerGlobalS
         }
     }
 
-    fn handle_event(self, event: MixedMessage) {
+    fn handle_event(&self, event: MixedMessage) {
         match event {
             MixedMessage::FromDevtools(msg) => {
                 let global_ref = GlobalRef::Worker(WorkerGlobalScopeCast::from_ref(self));
@@ -367,7 +355,7 @@ impl<'a> PrivateDedicatedWorkerGlobalScopeHelpers for &'a DedicatedWorkerGlobalS
         }
     }
 
-    fn dispatch_error_to_worker(self, errorevent: &ErrorEvent) {
+    fn dispatch_error_to_worker(&self, errorevent: &ErrorEvent) {
         let msg = errorevent.Message();
         let file_name = errorevent.Filename();
         let line_num = errorevent.Lineno();