cc: Remove background ticking from LTHI.

cc/test/scheduler_test_common.h

 // Copyright 2011 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.
 
 #ifndef CC_TEST_SCHEDULER_TEST_COMMON_H_
 #define CC_TEST_SCHEDULER_TEST_COMMON_H_
 
 #include <string>
 
 #include "base/basictypes.h"
@@ skipping 123 matching lines @@
 };
 
 class TestScheduler;
 class TestSchedulerFrameSourcesConstructor
     : public SchedulerFrameSourcesConstructor {
  public:
   ~TestSchedulerFrameSourcesConstructor() override;
 
  protected:
   BeginFrameSource* ConstructPrimaryFrameSource(Scheduler* scheduler) override;
-  BeginFrameSource* ConstructBackgroundFrameSource(
-      Scheduler* scheduler) override;
   BeginFrameSource* ConstructUnthrottledFrameSource(
       Scheduler* scheduler) override;
 
   OrderedSimpleTaskRunner* test_task_runner_;
   TestNowSource* now_src_;
 
  protected:
   explicit TestSchedulerFrameSourcesConstructor(
       OrderedSimpleTaskRunner* test_task_runner,
       TestNowSource* now_src);
@@ skipping 54 matching lines @@
       const scoped_refptr<OrderedSimpleTaskRunner>& test_task_runner,
       TestSchedulerFrameSourcesConstructor* frame_sources_constructor,
       scoped_ptr<BeginFrameSource> external_begin_frame_source);
 
   scoped_refptr<TestNowSource> now_src_;
 };
 
 }  // namespace cc
 
 #endif  // CC_TEST_SCHEDULER_TEST_COMMON_H_