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

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

Index: third_party/WebKit/Source/core/animation/KeyframeEffectModel.cpp
diff --git a/third_party/WebKit/Source/core/animation/KeyframeEffectModel.cpp b/third_party/WebKit/Source/core/animation/KeyframeEffectModel.cpp
index f88e814e46ba80778fc055dd93ca24aa19bc59b9..1c02f196f1637fb4220571063a9702f2c06971f9 100644
--- a/third_party/WebKit/Source/core/animation/KeyframeEffectModel.cpp
+++ b/third_party/WebKit/Source/core/animation/KeyframeEffectModel.cpp
@@ -137,7 +137,7 @@ KeyframeEffectModelBase::normalizedKeyframes(const KeyframeVector& keyframes) {
       DCHECK_GE(offset, lastOffset);
       lastOffset = offset;
     }
-    result.append(keyframe->clone());
+    result.push_back(keyframe->clone());
   }
 
   if (result.isEmpty())
@@ -274,7 +274,7 @@ void KeyframeEffectModelBase::PropertySpecificKeyframeGroup::appendKeyframe(
     PassRefPtr<Keyframe::PropertySpecificKeyframe> keyframe) {
   DCHECK(m_keyframes.isEmpty() ||
          m_keyframes.back()->offset() <= keyframe->offset());
-  m_keyframes.append(keyframe);
+  m_keyframes.push_back(keyframe);
 }
 
 void KeyframeEffectModelBase::PropertySpecificKeyframeGroup::