Add a Mojo EDK for Chrome that uses one OS pipe per message pipe.

extensions/renderer/BUILD.gn

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("//build/config/features.gni")
 import("//extensions/extensions.gni")
 
 assert(enable_extensions)
 
 # GYP version: extensions/extensions.gyp:extensions_renderer
@@ skipping 10 matching lines @@
   ]
 
   deps = [
     "//chrome:resources",
     "//components/guest_view/renderer",
     "//content:resources",
     "//extensions:extensions_resources",
     "//gin",
     "//skia",
     "//third_party/WebKit/public:blink",
-    "//third_party/mojo/src/mojo/edk/js",
     "//third_party/mojo/src/mojo/public/js",
   ]
+
+  if (use_chrome_edk) {
+    deps += [ "//mojo/edk/js" ]
+  } else {
+    deps += [ "//third_party/mojo/src/mojo/edk/js" ]
+  }
 }