cc: Fix const value pattern by replacing it by non-const or reference.

cc/trees/layer_tree_host_unittest_scroll.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 "base/location.h"
 #include "base/memory/ptr_util.h"
 #include "base/memory/weak_ptr.h"
 #include "base/single_thread_task_runner.h"
@@ skipping 1847 matching lines @@
   void BeginTest() override {
     DCHECK(HasImplThread());
     ImplThreadTaskRunner()->PostTask(
         FROM_HERE,
         base::Bind(&LayerTreeHostScrollTestElasticOverscroll::BindInputHandler,
                    base::Unretained(this),
                    layer_tree_host()->GetInputHandler()));
     PostSetNeedsCommitToMainThread();
   }
 
-  void BindInputHandler(const base::WeakPtr<InputHandler> input_handler) {
+  void BindInputHandler(base::WeakPtr<InputHandler> input_handler) {
     DCHECK(task_runner_provider()->IsImplThread());
     input_handler->BindToClient(&input_handler_client_);
     scroll_elasticity_helper_ = input_handler->CreateScrollElasticityHelper();
     DCHECK(scroll_elasticity_helper_);
   }
 
   void ApplyViewportDeltas(const gfx::Vector2dF& inner_delta,
                            const gfx::Vector2dF& outer_delta,
                            const gfx::Vector2dF& elastic_overscroll_delta,
                            float scale,
@@ skipping 186 matching lines @@
  private:
   gfx::ScrollOffset initial_scroll_;
   gfx::ScrollOffset second_scroll_;
   gfx::Vector2dF scroll_amount_;
 };
 
 SINGLE_AND_MULTI_THREAD_TEST_F(LayerTreeHostScrollTestPropertyTreeUpdate);
 
 }  // namespace
 }  // namespace cc