Android: Explicitly tear down LayerTreeHost first, take 2

content/browser/renderer_host/compositor_impl_android.h

Index: content/browser/renderer_host/compositor_impl_android.h
diff --git a/content/browser/renderer_host/compositor_impl_android.h b/content/browser/renderer_host/compositor_impl_android.h
index 0072979eb1b98c700a959645f3d05f8bbb5ff455..522aa5f8ce44d12e8df72e02af3e03210d272166 100644
--- a/content/browser/renderer_host/compositor_impl_android.h
+++ b/content/browser/renderer_host/compositor_impl_android.h
@@ -162,6 +162,8 @@ class CONTENT_EXPORT CompositorImpl
   scoped_refptr<cc::Layer> root_layer_;
   scoped_refptr<cc::Layer> subroot_layer_;
 
+  // Destruction order matters here:
+  base::ObserverList<VSyncObserver, true> observer_list_;
   scoped_ptr<cc::LayerTreeHost> host_;
   ui::ResourceManagerImpl resource_manager_;
 
@@ -222,8 +224,6 @@ class CONTENT_EXPORT CompositorImpl
 
   gpu::Capabilities gpu_capabilities_;
 
-  base::ObserverList<VSyncObserver, true> observer_list_;
-
   base::WeakPtrFactory<CompositorImpl> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(CompositorImpl);