EDK: Move {platform_handle,scoped_platform_handle}.* to //mojo/edk/platform.

mojo/edk/embedder/simple_platform_support.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_SIMPLE_PLATFORM_SUPPORT_H_
 #define MOJO_EDK_EMBEDDER_SIMPLE_PLATFORM_SUPPORT_H_
 
 #include "mojo/edk/embedder/platform_support.h"
 #include "mojo/public/cpp/system/macros.h"
 
 namespace mojo {
 namespace embedder {
 
 // A simple implementation of |PlatformSupport|, when sandboxing and
 // multiprocess support are not issues (e.g., in most tests). Note: This class
 // has no state, and different instances of |SimplePlatformSupport| are mutually
 // compatible (i.e., you don't need to use a single instance of it everywhere --
 // you may simply create one whenever/wherever you need it).
 class SimplePlatformSupport final : public PlatformSupport {
  public:
   SimplePlatformSupport() {}
   ~SimplePlatformSupport() override {}
 
   MojoTimeTicks GetTimeTicksNow() override;
   void GetCryptoRandomBytes(void* bytes, size_t num_bytes) override;
   util::RefPtr<PlatformSharedBuffer> CreateSharedBuffer(
       size_t num_bytes) override;
   util::RefPtr<PlatformSharedBuffer> CreateSharedBufferFromHandle(
       size_t num_bytes,
-      ScopedPlatformHandle platform_handle) override;
+      platform::ScopedPlatformHandle platform_handle) override;
 
  private:
   MOJO_DISALLOW_COPY_AND_ASSIGN(SimplePlatformSupport);
 };
 
 }  // namespace embedder
 }  // namespace mojo
 
 #endif  // MOJO_EDK_EMBEDDER_SIMPLE_PLATFORM_SUPPORT_H_