Maintain minimal error response.

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 ad4ca6585c0ed312674a13f778b410b02afd0e84..6c0d88981bb8467e766a03c7b8bac012d319c465 100644
--- a/content/test/test_render_view_host.h
+++ b/content/test/test_render_view_host.h
@@ -111,10 +111,11 @@ class TestRenderWidgetHostView : public RenderWidgetHostViewBase {
   void SetTooltipText(const base::string16& tooltip_text) override {}
   void SelectionBoundsChanged(
       const ViewHostMsg_SelectionBounds_Params& params) override {}
-  void CopyFromCompositingSurface(const gfx::Rect& src_subrect,
-                                  const gfx::Size& dst_size,
-                                  ReadbackRequestCallback& callback,
-                                  const SkColorType color_type) override;
+  void CopyFromCompositingSurface(
+      const gfx::Rect& src_subrect,
+      const gfx::Size& dst_size,
+      ReadbackRequestCallback& callback,
+      const SkColorType preferred_color_type) override;
   void CopyFromCompositingSurfaceToVideoFrame(
       const gfx::Rect& src_subrect,
       const scoped_refptr<media::VideoFrame>& target,