cc: Remove the opaque rect return-parameter from ContentLayerClient.

cc/test/solid_color_content_layer_client.cc

Index: cc/test/solid_color_content_layer_client.cc
diff --git a/cc/test/solid_color_content_layer_client.cc b/cc/test/solid_color_content_layer_client.cc
index 8c9de1c1f33f8c782832a5a2193856d275cf6dc0..7199f3697160928d9561efcccab3600b7c064021 100644
--- a/cc/test/solid_color_content_layer_client.cc
+++ b/cc/test/solid_color_content_layer_client.cc
@@ -14,7 +14,6 @@ namespace cc {
 void SolidColorContentLayerClient::PaintContents(
     SkCanvas* canvas,
     const gfx::Rect& rect,
-    gfx::RectF* opaque_rect,
     ContentLayerClient::GraphicsContextStatus gc_status) {
   SkPaint paint;
   paint.setStyle(SkPaint::kFill_Style);
@@ -24,9 +23,6 @@ void SolidColorContentLayerClient::PaintContents(
   canvas->drawRect(
       SkRect::MakeXYWH(rect.x(), rect.y(), rect.width(), rect.height()),
       paint);
-
-  if (SkColorGetA(color_) == 255)
-    *opaque_rect = rect;
 }
 
 bool SolidColorContentLayerClient::FillsBoundsCompletely() const {