exo: Directly create GpuMemoryBufferImpl when a handle is available.

gpu/command_buffer/client/gpu_memory_buffer_manager.h

Index: gpu/command_buffer/client/gpu_memory_buffer_manager.h
diff --git a/gpu/command_buffer/client/gpu_memory_buffer_manager.h b/gpu/command_buffer/client/gpu_memory_buffer_manager.h
index 7fb14af17a1b6392af3da9e6ddd66f0a18c18218..b75780bbc14921cd33d7646272734e456ff1861f 100644
--- a/gpu/command_buffer/client/gpu_memory_buffer_manager.h
+++ b/gpu/command_buffer/client/gpu_memory_buffer_manager.h
@@ -28,12 +28,6 @@ class GPU_EXPORT GpuMemoryBufferManager {
       gfx::BufferUsage usage,
       gpu::SurfaceHandle surface_handle) = 0;
 
-  // Creates a GpuMemoryBuffer from existing handle.
-  virtual std::unique_ptr<gfx::GpuMemoryBuffer> CreateGpuMemoryBufferFromHandle(
-      const gfx::GpuMemoryBufferHandle& handle,
-      const gfx::Size& size,
-      gfx::BufferFormat format) = 0;
-
   // Associates destruction sync point with |buffer|.
   virtual void SetDestructionSyncToken(gfx::GpuMemoryBuffer* buffer,
                                        const gpu::SyncToken& sync_token) = 0;