diff --git a/components/msg/Cargo.toml b/components/msg/Cargo.toml
index 1d859502785..7a2cbfd61e0 100644
--- a/components/msg/Cargo.toml
+++ b/components/msg/Cargo.toml
@@ -10,10 +10,6 @@ path = "lib.rs"
 [dependencies.util]
 path = "../util"
 
-[dependencies.azure]
-git = "https://github.com/servo/rust-azure"
-features = ["plugins"]
-
 [dependencies.layers]
 git = "https://github.com/servo/rust-layers"
 features = ["plugins"]
@@ -26,7 +22,6 @@ path = "../plugins"
 
 [dependencies]
 cssparser = { version = "0.4", features = [ "serde-serialization" ] }
-app_units = {version = "0.1", features = ["plugins"]}
 bitflags = "0.3"
 hyper = { version = "0.7", features = [ "serde-serialization" ] }
 rustc-serialize = "0.3.4"
@@ -34,7 +29,3 @@ euclid = {version = "0.4", features = ["plugins"]}
 serde = "0.6"
 serde_macros = "0.6"
 url = "0.5.2"
-
-[target.x86_64-apple-darwin.dependencies]
-core-foundation = "0.2"
-io-surface = "0.1.0"
diff --git a/components/msg/lib.rs b/components/msg/lib.rs
index 0d88a456917..473793b1bed 100644
--- a/components/msg/lib.rs
+++ b/components/msg/lib.rs
@@ -5,17 +5,11 @@
 #![feature(custom_attribute, custom_derive, plugin)]
 #![plugin(serde_macros, plugins)]
 
-extern crate app_units;
-extern crate azure;
 #[macro_use]
 extern crate bitflags;
-#[cfg(target_os = "macos")]
-extern crate core_foundation;
 extern crate cssparser;
 extern crate euclid;
 extern crate hyper;
-#[cfg(target_os = "macos")]
-extern crate io_surface;
 extern crate ipc_channel;
 extern crate layers;
 extern crate rustc_serialize;
diff --git a/components/servo/Cargo.lock b/components/servo/Cargo.lock
index a2d8f97fbcf..a7a5c99a7d0 100644
--- a/components/servo/Cargo.lock
+++ b/components/servo/Cargo.lock
@@ -1120,14 +1120,10 @@ dependencies = [
 name = "msg"
 version = "0.0.1"
 dependencies = [
- "app_units 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "azure 0.2.1 (git+https://github.com/servo/rust-azure)",
  "bitflags 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "core-foundation 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "cssparser 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "euclid 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "hyper 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "io-surface 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "ipc-channel 0.1.0 (git+https://github.com/servo/ipc-channel)",
  "layers 0.2.0 (git+https://github.com/servo/rust-layers)",
  "plugins 0.0.1",
diff --git a/ports/cef/Cargo.lock b/ports/cef/Cargo.lock
index ba56ff4f03a..71f5d560bf9 100644
--- a/ports/cef/Cargo.lock
+++ b/ports/cef/Cargo.lock
@@ -1078,14 +1078,10 @@ dependencies = [
 name = "msg"
 version = "0.0.1"
 dependencies = [
- "app_units 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "azure 0.2.1 (git+https://github.com/servo/rust-azure)",
  "bitflags 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "core-foundation 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "cssparser 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "euclid 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "hyper 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "io-surface 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "ipc-channel 0.1.0 (git+https://github.com/servo/ipc-channel)",
  "layers 0.2.0 (git+https://github.com/servo/rust-layers)",
  "plugins 0.0.1",
diff --git a/ports/geckolib/Cargo.lock b/ports/geckolib/Cargo.lock
index b8a7531eacf..c1e53d28694 100644
--- a/ports/geckolib/Cargo.lock
+++ b/ports/geckolib/Cargo.lock
@@ -598,14 +598,10 @@ dependencies = [
 name = "msg"
 version = "0.0.1"
 dependencies = [
- "app_units 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "azure 0.2.1 (git+https://github.com/servo/rust-azure)",
  "bitflags 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "core-foundation 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "cssparser 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "euclid 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "hyper 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "io-surface 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "ipc-channel 0.1.0 (git+https://github.com/servo/ipc-channel)",
  "layers 0.2.0 (git+https://github.com/servo/rust-layers)",
  "plugins 0.0.1",
diff --git a/ports/gonk/Cargo.lock b/ports/gonk/Cargo.lock
index c9a8717940b..58f283bf483 100644
--- a/ports/gonk/Cargo.lock
+++ b/ports/gonk/Cargo.lock
@@ -1046,14 +1046,10 @@ dependencies = [
 name = "msg"
 version = "0.0.1"
 dependencies = [
- "app_units 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "azure 0.2.1 (git+https://github.com/servo/rust-azure)",
  "bitflags 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "core-foundation 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "cssparser 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "euclid 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "hyper 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "io-surface 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "ipc-channel 0.1.0 (git+https://github.com/servo/ipc-channel)",
  "layers 0.2.0 (git+https://github.com/servo/rust-layers)",
  "plugins 0.0.1",