exo: Directly create GpuMemoryBufferImpl when a handle is available.

content/child/child_gpu_memory_buffer_manager.cc

 // 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.
 
 #include "content/child/child_gpu_memory_buffer_manager.h"
 
 #include <memory>
 #include <utility>
 
 #include "content/common/child_process_messages.h"
@@ skipping 46 matching lines @@
                      handle.id)));
   if (!buffer) {
     sender_->Send(new ChildProcessHostMsg_DeletedGpuMemoryBuffer(
         handle.id, gpu::SyncToken()));
     return nullptr;
   }
 
   return std::move(buffer);
 }
 
-std::unique_ptr<gfx::GpuMemoryBuffer>
-ChildGpuMemoryBufferManager::CreateGpuMemoryBufferFromHandle(
-    const gfx::GpuMemoryBufferHandle& handle,
-    const gfx::Size& size,
-    gfx::BufferFormat format) {
-  NOTIMPLEMENTED();
-  return nullptr;
-}
-
 void ChildGpuMemoryBufferManager::SetDestructionSyncToken(
     gfx::GpuMemoryBuffer* buffer,
     const gpu::SyncToken& sync_token) {
   static_cast<gpu::GpuMemoryBufferImpl*>(buffer)->set_destruction_sync_token(
       sync_token);
 }
 
 }  // namespace content