WTF/std normalization: replace WTF::Vector::first() with ::front()

third_party/WebKit/Source/core/animation/css/CSSAnimations.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 151 matching lines @@
     keyframes.prepend(startKeyframe);
   }
   RefPtr<StringKeyframe> endKeyframe = keyframes[keyframes.size() - 1];
   if (endKeyframe->offset() != 1) {
     endKeyframe = StringKeyframe::create();
     endKeyframe->setOffset(1);
     endKeyframe->setEasing(defaultTimingFunction);
     keyframes.append(endKeyframe);
   }
   DCHECK_GE(keyframes.size(), 2U);
-  DCHECK(!keyframes.first()->offset());
+  DCHECK(!keyframes.front()->offset());
   DCHECK_EQ(keyframes.back()->offset(), 1);
 
   // This is used for use counting neutral keyframes running on the compositor.
   PropertySet allProperties;
   for (const auto& keyframe : keyframes) {
     for (const auto& property : keyframe->properties())
       allProperties.add(property.cssProperty());
   }
   const PropertyHandleSet& startKeyframeProperties =
       startKeyframe->properties();
@@ skipping 911 matching lines @@
   return toShadowRoot(treeScope.rootNode()).host() == element;
 }
 
 DEFINE_TRACE(CSSAnimations) {
   visitor->trace(m_transitions);
   visitor->trace(m_pendingUpdate);
   visitor->trace(m_runningAnimations);
 }
 
 }  // namespace blink