Use C++11 range-based loop for core/clipboard, core/dom and core/testing

Source/core/dom/StyleEngine.cpp

Index: Source/core/dom/StyleEngine.cpp
diff --git a/Source/core/dom/StyleEngine.cpp b/Source/core/dom/StyleEngine.cpp
index 5014a8d903bfcc8988a84db6b3852ca87c218bcb..4702dcdbe60af43dd33f49a5b7617d3801296189 100644
--- a/Source/core/dom/StyleEngine.cpp
+++ b/Source/core/dom/StyleEngine.cpp
@@ -346,8 +346,8 @@ bool StyleEngine::shouldUpdateShadowTreeStyleSheetCollection(StyleResolverUpdate
 
 void StyleEngine::clearMediaQueryRuleSetOnTreeScopeStyleSheets(TreeScopeSet treeScopes)
 {
-    for (TreeScopeSet::iterator it = treeScopes.begin(); it != treeScopes.end(); ++it) {
-        TreeScope& treeScope = **it;
+    for (auto it : treeScopes) {
+        TreeScope& treeScope = *it;
         ASSERT(treeScope != m_document);
         ShadowTreeStyleSheetCollection* collection = static_cast<ShadowTreeStyleSheetCollection*>(styleSheetCollectionFor(treeScope));
         ASSERT(collection);
@@ -386,8 +386,8 @@ void StyleEngine::updateActiveStyleSheets(StyleResolverUpdateMode updateMode)
         TreeScopeSet treeScopes = updateMode == FullStyleUpdate ? m_activeTreeScopes : m_dirtyTreeScopes;
         HashSet<TreeScope*> treeScopesRemoved;
 
-        for (TreeScopeSet::iterator it = treeScopes.begin(); it != treeScopes.end(); ++it) {
-            TreeScope* treeScope = *it;
+        for (auto it : treeScopes) {
+            TreeScope* treeScope = it;
             ASSERT(treeScope != m_document);
             ShadowTreeStyleSheetCollection* collection = static_cast<ShadowTreeStyleSheetCollection*>(styleSheetCollectionFor(*treeScope));
             ASSERT(collection);