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

mojo/system/platform_channel_pair.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef MOJO_SYSTEM_PLATFORM_CHANNEL_PAIR_H_
 #define MOJO_SYSTEM_PLATFORM_CHANNEL_PAIR_H_
 
 #include "base/macros.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/process/launch.h"
 #include "mojo/system/scoped_platform_handle.h"
 #include "mojo/system/system_impl_export.h"
 
 class CommandLine;
 
 namespace mojo {
-namespace system {
+namespace embedder {
 
 // This is used to create a pair of |PlatformHandle|s that are connected by a
 // suitable (platform-specific) bidirectional "pipe" (e.g., socket on POSIX,
 // named pipe on Windows). The resulting handles can then be used in the same
 // process (e.g., in tests) or between processes. (The "server" handle is the
 // one that will be used in the process that created the pair, whereas the
 // "client" handle is the one that will be used in a different process.)
 //
 // This class provides facilities for passing the client handle to a child
 // process. The parent should call |PrepareToPassClientHandlelToChildProcess()|
@@ skipping 32 matching lines @@
   // any cleanup necessary.
   void ChildProcessLaunched();
 
  private:
   ScopedPlatformHandle server_handle_;
   ScopedPlatformHandle client_handle_;
 
   DISALLOW_COPY_AND_ASSIGN(PlatformChannelPair);
 };
 
-}  // namespace system
+}  // namespace embedder
 }  // namespace mojo
 
 #endif  // MOJO_SYSTEM_PLATFORM_CHANNEL_PAIR_H_