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

Source/core/layout/ImageQualityController.cpp

Index: Source/core/layout/ImageQualityController.cpp
diff --git a/Source/core/layout/ImageQualityController.cpp b/Source/core/layout/ImageQualityController.cpp
index 9c45ec79065a8ce56c575fb86c3eecbc0305b812..861ad37061cb1c4a77378c0efa02c7e772566937 100644
--- a/Source/core/layout/ImageQualityController.cpp
+++ b/Source/core/layout/ImageQualityController.cpp
@@ -131,7 +131,7 @@ void ImageQualityController::highQualityRepaintTimerFired(Timer<ImageQualityCont
         return;
     m_animatedResizeIsActive = false;
 
-    for (ObjectLayerSizeMap::iterator it = m_objectLayerSizeMap.begin(); it != m_objectLayerSizeMap.end(); ++it) {
+    for (auto it = m_objectLayerSizeMap.begin(); it != m_objectLayerSizeMap.end(); ++it) {

[pdr., 2015/04/08 03:03:28]

Can you change 'it' to a better name? As written, this is less readable. For
cleanup patches like this, writing a better name forces us to understand the
code. Similar comments for all other 'it' instances in this patch.

We can use a range-based loop over the keys here too.

         if (LocalFrame* frame = it->key->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()) {