exo: Directly create GpuMemoryBufferImpl when a handle is available.

services/ui/common/server_gpu_memory_buffer_manager.cc

Index: services/ui/common/server_gpu_memory_buffer_manager.cc
diff --git a/services/ui/common/server_gpu_memory_buffer_manager.cc b/services/ui/common/server_gpu_memory_buffer_manager.cc
index 490de2fd3c5fa86c397ffa2d06506e87f22ecb2f..a420040ed233ed150f01ca63987bc7b1e379cc06 100644
--- a/services/ui/common/server_gpu_memory_buffer_manager.cc
+++ b/services/ui/common/server_gpu_memory_buffer_manager.cc
@@ -67,15 +67,6 @@ ServerGpuMemoryBufferManager::CreateGpuMemoryBuffer(
                  weak_factory_.GetWeakPtr(), id, client_id_));
 }
 
-std::unique_ptr<gfx::GpuMemoryBuffer>
-ServerGpuMemoryBufferManager::CreateGpuMemoryBufferFromHandle(
-    const gfx::GpuMemoryBufferHandle& handle,
-    const gfx::Size& size,
-    gfx::BufferFormat format) {
-  NOTIMPLEMENTED();
-  return nullptr;
-}
-
 void ServerGpuMemoryBufferManager::SetDestructionSyncToken(
     gfx::GpuMemoryBuffer* buffer,
     const gpu::SyncToken& sync_token) {