third_party/WebKit: fix typos found in comments

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 269 matching lines @@
     for (bool& flag : cancelRunningAnimationFlags)
         flag = true;
 
     if (animationData && style.display() != NONE) {
         const Vector<AtomicString>& nameList = animationData->nameList();
         for (size_t i = 0; i < nameList.size(); ++i) {
             AtomicString name = nameList[i];
             if (name == CSSAnimationData::initialName())
                 continue;
 
-            // Find n where this is the nth occurence of this animation name.
+            // Find n where this is the nth occurrence of this animation name.
             size_t nameIndex = 0;
             for (size_t j = 0; j < i; j++) {
                 if (nameList[j] == name)
                     nameIndex++;
             }
 
             const bool isPaused = CSSTimingData::getRepeated(animationData->playStateList(), i) == AnimPlayStatePaused;
 
             Timing timing = animationData->convertToTiming(i);
             Timing specifiedTiming = timing;
@@ skipping 537 matching lines @@
 }
 
 DEFINE_TRACE(CSSAnimations)
 {
     visitor->trace(m_transitions);
     visitor->trace(m_pendingUpdate);
     visitor->trace(m_runningAnimations);
 }
 
 } // namespace blink