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

cc/animation/animation_host_unittest.cc

Index: cc/animation/animation_host_unittest.cc
diff --git a/cc/animation/animation_host_unittest.cc b/cc/animation/animation_host_unittest.cc
index cf828f63f4106211099bc7cbc42920737de628fa..6c396252b3c825f82f2be1f96e584b0973aeaec1 100644
--- a/cc/animation/animation_host_unittest.cc
+++ b/cc/animation/animation_host_unittest.cc
@@ -24,8 +24,9 @@ class AnimationHostTest : public AnimationTimelinesTest {
 // animation_player_unittest.cc.
 
 TEST_F(AnimationHostTest, SyncTimelinesAddRemove) {
-  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();
@@ -56,8 +57,9 @@ TEST_F(AnimationHostTest, SyncTimelinesAddRemove) {
 }
 
 TEST_F(AnimationHostTest, ImplOnlyTimeline) {
-  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_id1 = AnimationIdProvider::NextTimelineId();