exo: Directly create GpuMemoryBufferImpl when a handle is available.

blimp/client/support/compositor/blimp_gpu_memory_buffer_manager.h

Index: blimp/client/support/compositor/blimp_gpu_memory_buffer_manager.h
diff --git a/blimp/client/support/compositor/blimp_gpu_memory_buffer_manager.h b/blimp/client/support/compositor/blimp_gpu_memory_buffer_manager.h
index 04e921c98764bfa873181798bdd868ffacb7fb6f..1b09f6691bc93de78111fcef0443d4cf004bf48b 100644
--- a/blimp/client/support/compositor/blimp_gpu_memory_buffer_manager.h
+++ b/blimp/client/support/compositor/blimp_gpu_memory_buffer_manager.h
@@ -27,10 +27,6 @@ class BlimpGpuMemoryBufferManager : public gpu::GpuMemoryBufferManager {
       gfx::BufferFormat format,
       gfx::BufferUsage usage,
       gpu::SurfaceHandle surface_handle) override;
-  std::unique_ptr<gfx::GpuMemoryBuffer> CreateGpuMemoryBufferFromHandle(
-      const gfx::GpuMemoryBufferHandle& handle,
-      const gfx::Size& size,
-      gfx::BufferFormat format) override;
   void SetDestructionSyncToken(gfx::GpuMemoryBuffer* buffer,
                                const gpu::SyncToken& sync_token) override;