cc: Remove RenderingStats passed to ContentLayerUpdater during Layer::Update()

cc/layers/content_layer_unittest.cc

 // Copyright 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "cc/layers/content_layer.h"
 
 #include "cc/layers/content_layer_client.h"
 #include "cc/resources/bitmap_content_layer_updater.h"
 #include "cc/test/fake_rendering_stats_instrumentation.h"
 #include "cc/test/geometry_test_utils.h"
@@ skipping 32 matching lines @@
       BitmapContentLayerUpdater::Create(
           ContentLayerPainter::Create(&client).PassAs<LayerPainter>(),
           &stats_instrumentation,
           0);
 
   gfx::Rect resulting_opaque_rect;
   updater->PrepareToUpdate(content_rect,
                            gfx::Size(256, 256),
                            contents_scale,
                            contents_scale,
-                           &resulting_opaque_rect,
-                           NULL);
+                           &resulting_opaque_rect);
 
   EXPECT_EQ(opaque_rect_in_content_space.ToString(),
             resulting_opaque_rect.ToString());
 }
 
 }  // namespace
 }  // namespace cc