services/ui: Have an explicit lifetime/ownership of ui::GpuService.

content/renderer/render_thread_impl.h

Index: content/renderer/render_thread_impl.h
diff --git a/content/renderer/render_thread_impl.h b/content/renderer/render_thread_impl.h
index b8c2371e43cfef84b750f1242b0db43fc7fe906c..ad3e112b10f29950d16db5bbb2c1bd184b848eb4 100644
--- a/content/renderer/render_thread_impl.h
+++ b/content/renderer/render_thread_impl.h
@@ -87,6 +87,10 @@ namespace scheduler {
 class WebThreadBase;
 }
 
+namespace ui {
+class GpuService;
+}
+
 namespace v8 {
 class Extension;
 }
@@ -655,6 +659,10 @@ class CONTENT_EXPORT RenderThreadImpl
   std::unique_ptr<memory_coordinator::ChildMemoryCoordinatorImpl>
       memory_coordinator_;
 
+#if defined(USE_AURA)
+  std::unique_ptr<ui::GpuService> gpu_service_;
+#endif
+
   scoped_refptr<base::SingleThreadTaskRunner>
       main_thread_compositor_task_runner_;