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

chrome/browser/ui/BUILD.gn

Index: chrome/browser/ui/BUILD.gn
diff --git a/chrome/browser/ui/BUILD.gn b/chrome/browser/ui/BUILD.gn
index b3ad7434c5a467f53221e768f0e912d52ba1450f..864e43901c81383e25fc1780a323dc24d1556c9b 100644
--- a/chrome/browser/ui/BUILD.gn
+++ b/chrome/browser/ui/BUILD.gn
@@ -103,7 +103,6 @@ source_set("ui") {
       "//third_party/WebKit/public:resources",
       "//third_party/adobe/flash:flapper_version_h",
       "//third_party/leveldatabase",
-      "//third_party/mojo/src/mojo/edk/system",
       "//third_party/libjingle",
       "//third_party/re2",
       "//ui/base/ime",
@@ -112,6 +111,12 @@ source_set("ui") {
       "//ui/web_dialogs",
       "//v8",
     ]
+
+    if (use_chrome_edk) {
+      deps += [ "//mojo/edk/system" ]
+    } else {
+      deps += [ "//third_party/mojo/src/mojo/edk/system" ]
+    }
   } else {
     # iOS.
     sources +=
@@ -345,9 +350,7 @@ source_set("ui") {
   if (is_win) {
     sources +=
         rebase_path(gypi_values.chrome_browser_ui_win_sources, ".", "//chrome")
-    sources -= [
-      "views/frame/taskbar_decorator.cc",
-    ]
+    sources -= [ "views/frame/taskbar_decorator.cc" ]
     public_deps += [
       "//ui/views",
       "//ui/views/controls/webview",