Convert remaining scoped_ptr -> std::unique_ptr in //mojo/edk (minus js).

mojo/edk/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_EDK_EMBEDDER_PLATFORM_CHANNEL_PAIR_H_
 #define MOJO_EDK_EMBEDDER_PLATFORM_CHANNEL_PAIR_H_
 
-#include "base/memory/scoped_ptr.h"
 #include "base/process/launch.h"
 #include "mojo/edk/embedder/scoped_platform_handle.h"
 #include "mojo/edk/system/system_impl_export.h"
 #include "mojo/public/cpp/system/macros.h"
 
 namespace base {
 class CommandLine;
 }
 
 namespace mojo {
@@ skipping 57 matching lines @@
   ScopedPlatformHandle server_handle_;
   ScopedPlatformHandle client_handle_;
 
   MOJO_DISALLOW_COPY_AND_ASSIGN(PlatformChannelPair);
 };
 
 }  // namespace embedder
 }  // namespace mojo
 
 #endif  // MOJO_EDK_EMBEDDER_PLATFORM_CHANNEL_PAIR_H_