Migrate WTF::Vector::append() to ::push_back() [part 2 of N]

third_party/WebKit/Source/core/animation/CompositorAnimations.cpp

Index: third_party/WebKit/Source/core/animation/CompositorAnimations.cpp
diff --git a/third_party/WebKit/Source/core/animation/CompositorAnimations.cpp b/third_party/WebKit/Source/core/animation/CompositorAnimations.cpp
index 964839665561e23674b631873cf98f261135148e..c3891274cc5c3929b931a1084d8e14f5547c79d6 100644
--- a/third_party/WebKit/Source/core/animation/CompositorAnimations.cpp
+++ b/third_party/WebKit/Source/core/animation/CompositorAnimations.cpp
@@ -375,7 +375,7 @@ void CompositorAnimations::startAnimationOnCompositor(
     CompositorAnimationPlayer* compositorPlayer = animation.compositorPlayer();
     DCHECK(compositorPlayer);
     compositorPlayer->addAnimation(std::move(compositorAnimation));
-    startedAnimationIds.append(id);
+    startedAnimationIds.push_back(id);
   }
   DCHECK(!startedAnimationIds.isEmpty());
 }
@@ -617,7 +617,7 @@ void CompositorAnimations::getAnimationOnCompositor(
     animation->setDirection(compositorTiming.direction);
     animation->setPlaybackRate(compositorTiming.playbackRate);
     animation->setFillMode(compositorTiming.fillMode);
-    animations.append(std::move(animation));
+    animations.push_back(std::move(animation));
   }
   DCHECK(!animations.isEmpty());
 }