Avoid leaking SerializedHandles.

ppapi/proxy/gamepad_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/gamepad_resource.h"
 
 #include <string.h>
 
 #include "base/bind.h"
 #include "base/threading/platform_thread.h"
@@ skipping 80 matching lines @@
   // hardware thread is taking unusally long).
   if (contention_count < kMaximumContentionCount)
     ConvertWebKitGamepadData(read_into, &last_read_);
 
   memcpy(data, &last_read_, sizeof(PP_GamepadsSampleData));
 }
 
 void GamepadResource::OnPluginMsgSendMemory(
     const ResourceMessageReplyParams& params) {
   // On failure, the handle will be null and the CHECK below will be tripped.
-  base::SharedMemoryHandle handle;
-  params.GetSharedMemoryHandleAtIndex(0, &handle);
+  base::SharedMemoryHandle handle = base::SharedMemory::NULLHandle();
+  params.TakeSharedMemoryHandleAtIndex(0, &handle);
 
   shared_memory_.reset(new base::SharedMemory(handle, true));
   CHECK(shared_memory_->Map(sizeof(ContentGamepadHardwareBuffer)));
   buffer_ = static_cast<const ContentGamepadHardwareBuffer*>(
       shared_memory_->memory());
 }
 
 }  // namespace proxy
 }  // namespace ppapi