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

Source/core/dom/MutationObserverInterestGroup.cpp

Index: Source/core/dom/MutationObserverInterestGroup.cpp
diff --git a/Source/core/dom/MutationObserverInterestGroup.cpp b/Source/core/dom/MutationObserverInterestGroup.cpp
index ff525e5a861b55904418651dce5e910ee7e6d46f..6d250fc7c4f590fe88dcb18af1f93bef144cf138 100644
--- a/Source/core/dom/MutationObserverInterestGroup.cpp
+++ b/Source/core/dom/MutationObserverInterestGroup.cpp
@@ -56,8 +56,8 @@ MutationObserverInterestGroup::MutationObserverInterestGroup(WillBeHeapHashMap<R
 
 bool MutationObserverInterestGroup::isOldValueRequested()
 {
-    for (WillBeHeapHashMap<RawPtrWillBeMember<MutationObserver>, MutationRecordDeliveryOptions>::iterator iter = m_observers.begin(); iter != m_observers.end(); ++iter) {
-        if (hasOldValue(iter->value))
+    for (auto& observer : m_observers) {
+        if (hasOldValue(observer.value))
             return true;
     }
     return false;
@@ -67,9 +67,9 @@ void MutationObserverInterestGroup::enqueueMutationRecord(PassRefPtrWillBeRawPtr
 {
     RefPtrWillBeRawPtr<MutationRecord> mutation = prpMutation;
     RefPtrWillBeRawPtr<MutationRecord> mutationWithNullOldValue = nullptr;
-    for (WillBeHeapHashMap<RawPtrWillBeMember<MutationObserver>, MutationRecordDeliveryOptions>::iterator iter = m_observers.begin(); iter != m_observers.end(); ++iter) {
-        MutationObserver* observer = iter->key;
-        if (hasOldValue(iter->value)) {
+    for (auto& iter : m_observers) {
+        MutationObserver* observer = iter.key;
+        if (hasOldValue(iter.value)) {
             observer->enqueueMutationRecord(mutation);
             continue;
         }