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

mojo/edk/system/transport_data.h

Index: mojo/edk/system/transport_data.h
diff --git a/third_party/mojo/src/mojo/edk/system/transport_data.h b/mojo/edk/system/transport_data.h
similarity index 97%
copy from third_party/mojo/src/mojo/edk/system/transport_data.h
copy to mojo/edk/system/transport_data.h
index 20bb80fe3c37164a3a103273ddd203b3fbd9396b..d8ecb11d59f997c01a9cf894ef3e4cc4c5801074 100644
--- a/third_party/mojo/src/mojo/edk/system/transport_data.h
+++ b/mojo/edk/system/transport_data.h
@@ -21,8 +21,6 @@
 namespace mojo {
 namespace system {
 
-class Channel;
-
 // This class is used by |MessageInTransit| to represent handles (|Dispatcher|s)
 // in various stages of serialization.
 //
@@ -89,7 +87,7 @@ class MOJO_SYSTEM_IMPL_EXPORT TransportData {
   // The maximum total number of platform handles that may be attached.
   static size_t GetMaxPlatformHandles();
 
-  TransportData(scoped_ptr<DispatcherVector> dispatchers, Channel* channel);
+  explicit TransportData(scoped_ptr<DispatcherVector> dispatchers);
 
   // This is used for users of |MessageInTransit|/|TransportData|/|RawChannel|
   // that want to simply transport data and platform handles, and not
@@ -143,8 +141,7 @@ class MOJO_SYSTEM_IMPL_EXPORT TransportData {
   static scoped_ptr<DispatcherVector> DeserializeDispatchers(
       const void* buffer,
       size_t buffer_size,
-      embedder::ScopedPlatformHandleVectorPtr platform_handles,
-      Channel* channel);
+      embedder::ScopedPlatformHandleVectorPtr platform_handles);
 
  private:
   // To allow us to make compile-assertions about |Header|, etc. in the .cc