WTF/std normalization: replace WTF::Vector::last with ::back

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

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 500 matching lines @@
 
   CompositorTransformKeyframe transformKeyframe(
       keyframe->offset(), std::move(ops), keyframeTimingFunction);
   curve.addKeyframe(transformKeyframe);
 }
 
 template <typename PlatformAnimationCurveType>
 void addKeyframesToCurve(
     PlatformAnimationCurveType& curve,
     const AnimatableValuePropertySpecificKeyframeVector& keyframes) {
-  auto* lastKeyframe = keyframes.last().get();
+  auto* lastKeyframe = keyframes.back().get();
   for (const auto& keyframe : keyframes) {
     const TimingFunction* keyframeTimingFunction = 0;
     // Ignore timing function of last frame.
     if (keyframe == lastKeyframe)
       keyframeTimingFunction = LinearTimingFunction::shared();
     else
       keyframeTimingFunction = &keyframe->easing();
 
     const AnimatableValue* value = keyframe->getAnimatableValue().get();
     addKeyframeToCurve(curve, keyframe.get(), value, *keyframeTimingFunction);
@@ skipping 84 matching lines @@
     animation->setTimeOffset(compositorTiming.scaledTimeOffset);
     animation->setDirection(compositorTiming.direction);
     animation->setPlaybackRate(compositorTiming.playbackRate);
     animation->setFillMode(compositorTiming.fillMode);
     animations.append(std::move(animation));
   }
   DCHECK(!animations.isEmpty());
 }
 
 }  // namespace blink