Fix unused variables errors in cc/.

cc/animation/animation_timeline_unittest.cc

 // Copyright 2015 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/animation/animation_timeline.h"
 
 #include "cc/animation/animation_host.h"
 #include "cc/animation/animation_id_provider.h"
 #include "cc/animation/animation_player.h"
 #include "cc/test/animation_test_common.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace cc {
 namespace {
 
 TEST(AnimationTimelineTest, SyncPlayersAttachDetach) {
-  scoped_ptr<AnimationHost> host(AnimationHost::Create(ThreadInstance::MAIN));
-  scoped_ptr<AnimationHost> host_impl(
-      AnimationHost::Create(ThreadInstance::IMPL));
+  scoped_ptr<AnimationHost> host(AnimationHost::Create());
+  scoped_ptr<AnimationHost> host_impl(AnimationHost::Create());
 
   const int timeline_id = AnimationIdProvider::NextTimelineId();
   const int player_id = AnimationIdProvider::NextPlayerId();
 
   scoped_refptr<AnimationTimeline> timeline_impl(
       AnimationTimeline::Create(timeline_id));
   scoped_refptr<AnimationTimeline> timeline(
       AnimationTimeline::Create(timeline_id));
 
   host->AddAnimationTimeline(timeline.get());
@@ skipping 22 matching lines @@
   timeline->DetachPlayer(player.get());
   EXPECT_FALSE(player->animation_timeline());
 
   timeline->PushPropertiesTo(timeline_impl.get());
   EXPECT_FALSE(timeline_impl->GetPlayerById(player_id));
 
   EXPECT_FALSE(player_impl->animation_timeline());
 }
 
 TEST(AnimationTimelineTest, ClearPlayers) {
-  scoped_ptr<AnimationHost> host(AnimationHost::Create(ThreadInstance::MAIN));
-  scoped_ptr<AnimationHost> host_impl(
-      AnimationHost::Create(ThreadInstance::IMPL));
+  scoped_ptr<AnimationHost> host(AnimationHost::Create());
+  scoped_ptr<AnimationHost> host_impl(AnimationHost::Create());
 
   const int timeline_id = AnimationIdProvider::NextTimelineId();
   const int player_id1 = AnimationIdProvider::NextPlayerId();
   const int player_id2 = AnimationIdProvider::NextPlayerId();
 
   scoped_refptr<AnimationTimeline> timeline_impl(
       AnimationTimeline::Create(timeline_id));
   scoped_refptr<AnimationTimeline> timeline(
       AnimationTimeline::Create(timeline_id));
 
@@ skipping 14 matching lines @@
   EXPECT_FALSE(timeline->GetPlayerById(player_id1));
   EXPECT_FALSE(timeline->GetPlayerById(player_id2));
 
   timeline_impl->ClearPlayers();
   EXPECT_FALSE(timeline_impl->GetPlayerById(player_id1));
   EXPECT_FALSE(timeline_impl->GetPlayerById(player_id2));
 }
 
 }  // namespace
 }  // namespace cc