Use C++11 range-based loop for core/layout

Source/core/layout/ImageQualityController.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 113 matching lines @@
         m_timer.stop();
     }
 }
 
 void ImageQualityController::highQualityRepaintTimerFired(Timer<ImageQualityController>*)
 {
     if (!m_animatedResizeIsActive && !m_liveResizeOptimizationIsActive)
         return;
     m_animatedResizeIsActive = false;
 
-    for (ObjectLayerSizeMap::iterator it = m_objectLayerSizeMap.begin(); it != m_objectLayerSizeMap.end(); ++it) {
-        if (LocalFrame* frame = it->key->document().frame()) {
+    for (auto* layoutObject : m_objectLayerSizeMap.keys()) {
+        if (LocalFrame* frame = layoutObject->document().frame()) {
             // If this renderer's containing FrameView is in live resize, punt the timer and hold back for now.
             if (frame->view() && frame->view()->inLiveResize()) {
                 restartTimer();
                 return;
             }
         }
-        it->key->setShouldDoFullPaintInvalidation();
+        layoutObject->setShouldDoFullPaintInvalidation();
     }
 
     m_liveResizeOptimizationIsActive = false;
 }
 
 void ImageQualityController::restartTimer()
 {
     m_timer.startOneShot(cLowQualityTimeThreshold, FROM_HERE);
 }
 
@@ skipping 82 matching lines @@
     // This object has been resized to two different sizes while the timer
     // is active, so draw at low quality, set the flag for animated resizes and
     // the object to the list for high quality redraw.
     set(object, innerMap, layer, scaledLayoutSize);
     m_animatedResizeIsActive = true;
     restartTimer();
     return true;
 }
 
 } // namespace blink