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

content/common/mojo/channel_init.h

Index: content/common/mojo/channel_init.h
diff --git a/content/common/mojo/channel_init.h b/content/common/mojo/channel_init.h
index 2660a7bcbf285a155385f71bbad0e90b4b694dc2..564309b48cf5d57e644aeb326cd1fe72cccdc6b8 100644
--- a/content/common/mojo/channel_init.h
+++ b/content/common/mojo/channel_init.h
@@ -10,9 +10,12 @@
 #include "base/memory/weak_ptr.h"
 #include "content/common/content_export.h"
 #include "ipc/mojo/scoped_ipc_support.h"
-#include "third_party/mojo/src/mojo/edk/embedder/channel_info_forward.h"
 #include "third_party/mojo/src/mojo/public/cpp/system/message_pipe.h"
 
+#if !defined(USE_CHROME_EDK)
+#include "third_party/mojo/src/mojo/edk/embedder/channel_info_forward.h"
+#endif
+
 namespace base {
 class TaskRunner;
 }
@@ -39,6 +42,7 @@ class CONTENT_EXPORT ChannelInit {
   void ShutdownOnIOThread();
 
  private:
+#if !defined(USE_CHROME_EDK)
   // Invoked on the thread on which this object lives once the channel has been
   // established. This is a static method that takes a weak pointer to self,
   // since we want to destroy the channel if we were destroyed first.
@@ -49,6 +53,7 @@ class CONTENT_EXPORT ChannelInit {
 
   // If non-null the channel has been established.
   mojo::embedder::ChannelInfo* channel_info_;
+#endif
 
   scoped_ptr<IPC::ScopedIPCSupport> ipc_support_;
   base::WeakPtrFactory<ChannelInit> weak_factory_;