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

Source/core/css/CSSCanvasValue.cpp

Index: Source/core/css/CSSCanvasValue.cpp
diff --git a/Source/core/css/CSSCanvasValue.cpp b/Source/core/css/CSSCanvasValue.cpp
index b01502419962f2f04e56676da17ffcdfad6994a4..9d35c9db77b7c6e5428d5411df64ed95e39963fd 100644
--- a/Source/core/css/CSSCanvasValue.cpp
+++ b/Source/core/css/CSSCanvasValue.cpp
@@ -51,16 +51,14 @@ String CSSCanvasValue::customCSSText() const
 void CSSCanvasValue::canvasChanged(HTMLCanvasElement*, const FloatRect& changedRect)
 {
     IntRect imageChangeRect = enclosingIntRect(changedRect);
-    RenderObjectSizeCountMap::const_iterator end = clients().end();
-    for (RenderObjectSizeCountMap::const_iterator curr = clients().begin(); curr != end; ++curr)
-        const_cast<RenderObject*>(curr->key)->imageChanged(static_cast<WrappedImagePtr>(this), &imageChangeRect);
+    for (const auto& curr : clients())
+        const_cast<RenderObject*>(curr.key)->imageChanged(static_cast<WrappedImagePtr>(this), &imageChangeRect);
 }
 
 void CSSCanvasValue::canvasResized(HTMLCanvasElement*)
 {
-    RenderObjectSizeCountMap::const_iterator end = clients().end();
-    for (RenderObjectSizeCountMap::const_iterator curr = clients().begin(); curr != end; ++curr)
-        const_cast<RenderObject*>(curr->key)->imageChanged(static_cast<WrappedImagePtr>(this));
+    for (const auto& curr : clients())
+        const_cast<RenderObject*>(curr.key)->imageChanged(static_cast<WrappedImagePtr>(this));
 }
 
 #if !ENABLE(OILPAN)