Mojo: Move system embedder API files to mojo/system/embedder.

mojo/system/embedder/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_
+#ifndef MOJO_SYSTEM_EMBEDDER_PLATFORM_CHANNEL_PAIR_H_
+#define MOJO_SYSTEM_EMBEDDER_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/embedder/scoped_platform_handle.h"
 #include "mojo/system/system_impl_export.h"
 
 class CommandLine;
 
 namespace mojo {
 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
@@ skipping 41 matching lines @@
  private:
   ScopedPlatformHandle server_handle_;
   ScopedPlatformHandle client_handle_;
 
   DISALLOW_COPY_AND_ASSIGN(PlatformChannelPair);
 };
 
 }  // namespace embedder
 }  // namespace mojo
 
-#endif  // MOJO_SYSTEM_PLATFORM_CHANNEL_PAIR_H_
+#endif  // MOJO_SYSTEM_EMBEDDER_PLATFORM_CHANNEL_PAIR_H_