Make SharedMemoryHandle a class on windows.

ui/surface/transport_dib.h

 // Copyright (c) 2012 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 UI_SURFACE_TRANSPORT_DIB_H_
 #define UI_SURFACE_TRANSPORT_DIB_H_
 
 #include "base/basictypes.h"
 #include "base/memory/shared_memory.h"
 #include "ui/surface/surface_export.h"
 
 #if defined(OS_WIN)
 #include <windows.h>
 #endif
 
 class SkCanvas;
 
 // -----------------------------------------------------------------------------
 // A TransportDIB is a block of memory that is used to transport pixels
 // between processes: from the renderer process to the browser, and
 // between renderer and plugin processes.
 // -----------------------------------------------------------------------------
 class SURFACE_EXPORT TransportDIB {
  public:
   ~TransportDIB();
 
 // A Handle is the type which can be sent over the wire so that the remote
 // side can map the transport DIB.
-#if defined(OS_WIN)
-  typedef HANDLE Handle;
-#else  // OS_POSIX
   typedef base::SharedMemoryHandle Handle;
-#endif
 
   // Returns a default, invalid handle, that is meant to indicate a missing
   // Transport DIB.
   static Handle DefaultHandleValue() {
     return base::SharedMemory::NULLHandle();
   }
 
   // Create a new TransportDIB, returning NULL on failure.
   //
   // The size is the minimum size in bytes of the memory backing the transport
@@ skipping 51 matching lines @@
 
   explicit TransportDIB(base::SharedMemoryHandle dib);
   base::SharedMemory shared_memory_;
   uint32 sequence_num_;
   size_t size_;  // length, in bytes
 
   DISALLOW_COPY_AND_ASSIGN(TransportDIB);
 };
 
 #endif  // UI_SURFACE_TRANSPORT_DIB_H_