Mojo: Move PlatformChannelPair to its own files.

mojo/system/platform_channel_pair.h

-// Copyright 2013 The Chromium Authors. All rights reserved.
+// 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_H_
-#define MOJO_SYSTEM_PLATFORM_CHANNEL_H_
+#ifndef MOJO_SYSTEM_PLATFORM_CHANNEL_PAIR_H_
+#define MOJO_SYSTEM_PLATFORM_CHANNEL_PAIR_H_
 
-#include "base/basictypes.h"
+#include "base/macros.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/process/launch.h"
 #include "mojo/system/platform_channel_handle.h"
 #include "mojo/system/system_impl_export.h"
 
 class CommandLine;
 
 namespace mojo {
 namespace system {
 
-class MOJO_SYSTEM_IMPL_EXPORT PlatformChannel {
- public:
-  virtual ~PlatformChannel();
-
-  // Creates a channel if you already have the underlying handle for it, taking
-  // ownership of |handle|.
-  static scoped_ptr<PlatformChannel> CreateFromHandle(
-      const PlatformChannelHandle& handle);
-
-  // Returns the channel's handle, passing ownership.
-  PlatformChannelHandle PassHandle();
-
-  bool is_valid() const { return handle_.is_valid(); }
-
- protected:
-  PlatformChannel();
-
-  PlatformChannelHandle* mutable_handle() { return &handle_; }
-
- private:
-  PlatformChannelHandle handle_;
-
-  DISALLOW_COPY_AND_ASSIGN(PlatformChannel);
-};
+class PlatformChannel;
 
 // This is used to create a pair of connected |PlatformChannel|s. The resulting
 // channels can then be used in the same process (e.g., in tests) or between
 // processes. (The "server" channel is the one that will be used in the process
 // that created the pair, whereas the "client" channel is the one that will be
 // used in a different process.)
 //
 // This class provides facilities for passing the client channel to a child
 // process. The parent should call |PrepareToPassClientChannelToChildProcess()|
 // to get the data needed to do this, spawn the child using that data, and then
@@ skipping 37 matching lines @@
  private:
   PlatformChannelHandle server_handle_;
   PlatformChannelHandle client_handle_;
 
   DISALLOW_COPY_AND_ASSIGN(PlatformChannelPair);
 };
 
 }  // namespace system
 }  // namespace mojo
 
-#endif  // MOJO_SYSTEM_PLATFORM_CHANNEL_H_
+#endif  // MOJO_SYSTEM_PLATFORM_CHANNEL_PAIR_H_