Mojo: Move platform handle/channel stuff in system to embedder namespace.

mojo/system/platform_channel_pair.cc

Index: mojo/system/platform_channel_pair.cc
diff --git a/mojo/system/platform_channel_pair.cc b/mojo/system/platform_channel_pair.cc
index f1cd594cf0d7bef76d526fe9f0c196476d6da3f5..26a9d81e79db2842f9890af1f90a3452977e3b5e 100644
--- a/mojo/system/platform_channel_pair.cc
+++ b/mojo/system/platform_channel_pair.cc
@@ -7,7 +7,7 @@
 #include "base/logging.h"
 
 namespace mojo {
-namespace system {
+namespace embedder {
 
 PlatformChannelPair::~PlatformChannelPair() {
 }
@@ -20,5 +20,5 @@ ScopedPlatformHandle PlatformChannelPair::PassClientHandle() {
   return client_handle_.Pass();
 }
 
-}  // namespace system
+}  // namespace embedder
 }  // namespace mojo