Convert //cc from scoped_ptr to std::unique_ptr.

cc/animation/animation_timeline_unittest.cc

Index: cc/animation/animation_timeline_unittest.cc
diff --git a/cc/animation/animation_timeline_unittest.cc b/cc/animation/animation_timeline_unittest.cc
index 3b0bc5ab7301b923b71f7d2e20e64c296af37982..c3800240e7bc8cea598c4e95bfd3c44207e3f943 100644
--- a/cc/animation/animation_timeline_unittest.cc
+++ b/cc/animation/animation_timeline_unittest.cc
@@ -15,8 +15,9 @@ namespace cc {
 namespace {
 
 TEST(AnimationTimelineTest, SyncPlayersAttachDetach) {
-  scoped_ptr<AnimationHost> host(AnimationHost::Create(ThreadInstance::MAIN));
-  scoped_ptr<AnimationHost> host_impl(
+  std::unique_ptr<AnimationHost> host(
+      AnimationHost::Create(ThreadInstance::MAIN));
+  std::unique_ptr<AnimationHost> host_impl(
       AnimationHost::Create(ThreadInstance::IMPL));
 
   const int timeline_id = AnimationIdProvider::NextTimelineId();
@@ -60,8 +61,9 @@ TEST(AnimationTimelineTest, SyncPlayersAttachDetach) {
 }
 
 TEST(AnimationTimelineTest, ClearPlayers) {
-  scoped_ptr<AnimationHost> host(AnimationHost::Create(ThreadInstance::MAIN));
-  scoped_ptr<AnimationHost> host_impl(
+  std::unique_ptr<AnimationHost> host(
+      AnimationHost::Create(ThreadInstance::MAIN));
+  std::unique_ptr<AnimationHost> host_impl(
       AnimationHost::Create(ThreadInstance::IMPL));
 
   const int timeline_id = AnimationIdProvider::NextTimelineId();