Remove implicit conversions from scoped_refptr to T* in cc/trees/

cc/trees/layer_tree_host_perftest.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/trees/layer_tree_host.h"
 
 #include <sstream>
 
 #include "base/file_util.h"
 #include "base/files/file_path.h"
@@ skipping 166 matching lines @@
 // Invalidates a leaf layer in the tree on the main thread after every commit.
 class LayerTreeHostPerfTestLeafInvalidates
     : public LayerTreeHostPerfTestJsonReader {
  public:
   virtual void BuildTree() OVERRIDE {
     LayerTreeHostPerfTestJsonReader::BuildTree();
 
     // Find a leaf layer.
     for (layer_to_invalidate_ = layer_tree_host()->root_layer();
          layer_to_invalidate_->children().size();
-         layer_to_invalidate_ = layer_to_invalidate_->children()[0]) {}
+         layer_to_invalidate_ = layer_to_invalidate_->children()[0].get()) {
+    }
   }
 
   virtual void DidCommitAndDrawFrame() OVERRIDE {
     if (TestEnded())
       return;
 
     static bool flip = true;
     layer_to_invalidate_->SetOpacity(flip ? 1.f : 0.5f);
     flip = !flip;
   }
@@ skipping 130 matching lines @@
 TEST_F(LayerTreeHostPerfTestJsonReader, HeavyPageThreadedImplSide) {
   begin_frame_driven_drawing_ = true;
   measure_commit_cost_ = true;
   SetTestName("heavy_page");
   ReadTestFile("heavy_layer_tree");
   RunTestWithImplSidePainting();
 }
 
 }  // namespace
 }  // namespace cc