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

Source/core/dom/MutationObserver.cpp

Index: Source/core/dom/MutationObserver.cpp
diff --git a/Source/core/dom/MutationObserver.cpp b/Source/core/dom/MutationObserver.cpp
index 570ee3b9737c0eab300b48ae24b305ff189d302b..39c085766513360de4cb97c8fe6e6a0faf586f51 100644
--- a/Source/core/dom/MutationObserver.cpp
+++ b/Source/core/dom/MutationObserver.cpp
@@ -148,8 +148,8 @@ void MutationObserver::disconnect()
     m_records.clear();
     InspectorInstrumentation::didClearAllMutationRecords(m_callback->executionContext(), this);
     MutationObserverRegistrationSet registrations(m_registrations);
-    for (MutationObserverRegistrationSet::iterator iter = registrations.begin(); iter != registrations.end(); ++iter)
-        (*iter)->unregister();
+    for (auto iter : registrations)
+        iter->unregister();
     ASSERT(m_registrations.isEmpty());
 }
 
@@ -202,8 +202,8 @@ void MutationObserver::setHasTransientRegistration()
 WillBeHeapHashSet<RawPtrWillBeMember<Node> > MutationObserver::getObservedNodes() const
 {
     WillBeHeapHashSet<RawPtrWillBeMember<Node> > observedNodes;
-    for (MutationObserverRegistrationSet::const_iterator iter = m_registrations.begin(); iter != m_registrations.end(); ++iter)
-        (*iter)->addRegistrationNodesToSet(observedNodes);
+    for (const auto& iter : m_registrations)
+        iter->addRegistrationNodesToSet(observedNodes);
     return observedNodes;
 }
 
@@ -219,9 +219,9 @@ void MutationObserver::deliver()
     // Calling clearTransientRegistrations() can modify m_registrations, so it's necessary
     // to make a copy of the transient registrations before operating on them.
     WillBeHeapVector<RawPtrWillBeMember<MutationObserverRegistration>, 1> transientRegistrations;
-    for (MutationObserverRegistrationSet::iterator iter = m_registrations.begin(); iter != m_registrations.end(); ++iter) {
-        if ((*iter)->hasTransientRegistrations())
-            transientRegistrations.append(*iter);
+    for (auto iter : m_registrations) {
+        if (iter->hasTransientRegistrations())
+            transientRegistrations.append(iter);
     }
     for (size_t i = 0; i < transientRegistrations.size(); ++i)
         transientRegistrations[i]->clearTransientRegistrations();