ui: Add ref-counting to GLFence class.

gpu/ipc/service/gpu_command_buffer_stub.cc

Index: gpu/ipc/service/gpu_command_buffer_stub.cc
diff --git a/gpu/ipc/service/gpu_command_buffer_stub.cc b/gpu/ipc/service/gpu_command_buffer_stub.cc
index eb9205377c131f05c0ab87ec47941105b455c92c..8fc0a375906aa1a419a13b7a3338b0ba9100b2c0 100644
--- a/gpu/ipc/service/gpu_command_buffer_stub.cc
+++ b/gpu/ipc/service/gpu_command_buffer_stub.cc
@@ -1055,14 +1055,13 @@ void GpuCommandBufferStub::OnCreateFence(
     return;
   }
 
-  std::unique_ptr<gl::GLFence> fence =
-      channel()->CreateFenceForGpuFence(handle);
+  scoped_refptr<gl::GLFence> fence = channel()->CreateFenceForGpuFence(handle);
   if (!fence) {
     DLOG(ERROR) << "Failed to create GLFence from GpuFence handle.";
     return;
   }
 
-  fence_manager->AddFence(std::move(fence), id);
+  fence_manager->AddFence(fence.get(), id);
 }
 
 void GpuCommandBufferStub::OnDestroyFence(int32_t id) {