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

content/browser/mojo/mojo_application_host.cc

Index: content/browser/mojo/mojo_application_host.cc
diff --git a/content/browser/mojo/mojo_application_host.cc b/content/browser/mojo/mojo_application_host.cc
index b1a9382f9adfd02e361b142e79b3f1731343699a..ec923f29d22677b852a97c536f5ca6d3042b0c73 100644
--- a/content/browser/mojo/mojo_application_host.cc
+++ b/content/browser/mojo/mojo_application_host.cc
@@ -7,7 +7,12 @@
 #include "content/common/mojo/mojo_messages.h"
 #include "content/public/browser/browser_thread.h"
 #include "ipc/ipc_sender.h"
+
+#if defined(USE_CHROME_EDK)
+#include "mojo/edk/embedder/platform_channel_pair.h"
+#else
 #include "third_party/mojo/src/mojo/edk/embedder/platform_channel_pair.h"
+#endif
 
 namespace content {
 namespace {