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

mojo/edk/embedder/platform_channel_pair_posix.cc

Index: mojo/edk/embedder/platform_channel_pair_posix.cc
diff --git a/third_party/mojo/src/mojo/edk/embedder/platform_channel_pair_posix.cc b/mojo/edk/embedder/platform_channel_pair_posix.cc
similarity index 98%
copy from third_party/mojo/src/mojo/edk/embedder/platform_channel_pair_posix.cc
copy to mojo/edk/embedder/platform_channel_pair_posix.cc
index 2242cce61b8295b373f0def91baf877d432c4cc6..8cdac366cc985a13ce80130eaa93fa2ac1c1de1e 100644
--- a/third_party/mojo/src/mojo/edk/embedder/platform_channel_pair_posix.cc
+++ b/mojo/edk/embedder/platform_channel_pair_posix.cc
@@ -17,7 +17,7 @@
 #include "mojo/edk/embedder/platform_handle.h"
 
 namespace mojo {
-namespace embedder {
+namespace edk {
 
 namespace {
 
@@ -107,5 +107,5 @@ void PlatformChannelPair::PrepareToPassClientHandleToChildProcess(
                                   base::IntToString(target_fd));
 }
 
-}  // namespace embedder
+}  // namespace edk
 }  // namespace mojo