content: Remove Lock/Unlock CompositingSurface API from RWH.

content/test/test_render_view_host.h

Index: content/test/test_render_view_host.h
diff --git a/content/test/test_render_view_host.h b/content/test/test_render_view_host.h
index 2872cdb63fb3c799e6cbbdfe8e11bc4eef72c3e8..6b140364bc54d239ebe797f2c4868793a98b7aef 100644
--- a/content/test/test_render_view_host.h
+++ b/content/test/test_render_view_host.h
@@ -114,8 +114,6 @@ class TestRenderWidgetHostView : public RenderWidgetHostViewBase {
       const base::Callback<void(const gfx::Rect&, bool)>& callback) override;
   bool CanCopyToVideoFrame() const override;
   bool HasAcceleratedSurface(const gfx::Size& desired_size) override;
-  void LockCompositingSurface() override {}
-  void UnlockCompositingSurface() override {}
   gfx::Rect GetBoundsInRootWindow() override;
   bool LockMouse() override;
   void UnlockMouse() override;