Get rid of base::SharedMemory::NULLHandle();

ppapi/proxy/video_decoder_resource.cc

 // 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.
 
 #include "ppapi/proxy/video_decoder_resource.h"
 
 #include <utility>
 
 #include "base/bind.h"
 #include "gpu/command_buffer/client/gles2_cmd_helper.h"
@@ skipping 209 matching lines @@
     int32_t result =
         GenericSyncCall(RENDERER,
                         PpapiHostMsg_VideoDecoder_GetShm(shm_id, size),
                         &reply,
                         &reply_params);
     if (result != PP_OK)
       return PP_ERROR_FAILED;
     if (!UnpackMessage<PpapiPluginMsg_VideoDecoder_GetShmReply>(reply,
                                                                 &shm_size))
       return PP_ERROR_FAILED;
-    base::SharedMemoryHandle shm_handle = base::SharedMemory::NULLHandle();
+    base::SharedMemoryHandle shm_handle;
     if (!reply_params.TakeSharedMemoryHandleAtIndex(0, &shm_handle))
       return PP_ERROR_NOMEMORY;
     std::unique_ptr<base::SharedMemory> shm(
         new base::SharedMemory(shm_handle, false /* read_only */));
     std::unique_ptr<ShmBuffer> shm_buffer(
         new ShmBuffer(std::move(shm), shm_size, shm_id));
     if (!shm_buffer->addr)
       return PP_ERROR_NOMEMORY;
 
     available_shm_buffers_.push_back(shm_buffer.get());
@@ skipping 335 matching lines @@
     get_picture_0_1_->texture_target = texture_target;
     get_picture_0_1_->texture_size = texture_size;
     get_picture_0_1_ = NULL;
   }
 
   received_pictures_.pop();
 }
 
 }  // namespace proxy
 }  // namespace ppapi