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

mojo/fetcher/BUILD.gn

 # Copyright 2015 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("//third_party/mojo/src/mojo/public/tools/bindings/mojom.gni")
 
 source_set("fetcher") {
   sources = [
     "about_fetcher.cc",
     "about_fetcher.h",
@@ skipping 21 matching lines @@
     "//url",
   ]
   deps = [
     "//base/third_party/dynamic_annotations",
     "//crypto:crypto",
     "//mojo/application/public/cpp:sources",
     "//mojo/environment:chromium",
     "//mojo/shell",
     "//mojo/util:filename_util",
     "//net",
-    "//third_party/mojo/src/mojo/edk/system",
     "//url",
   ]
+
+  if (use_chrome_edk) {
+    deps += [ "//mojo/edk/system" ]
+  } else {
+    deps += [ "//third_party/mojo/src/mojo/edk/system" ]
+  }
 }