Modernize coding style in core/html/forms/.

Source/core/html/forms/FormController.cpp

Index: Source/core/html/forms/FormController.cpp
diff --git a/Source/core/html/forms/FormController.cpp b/Source/core/html/forms/FormController.cpp
index 4eb89c73c2890d508eafd747174b546a1267d2a1..968896876490be22cee69d43a41b0a7913c2baf9 100644
--- a/Source/core/html/forms/FormController.cpp
+++ b/Source/core/html/forms/FormController.cpp
@@ -189,7 +189,7 @@ public:
 private:
     SavedFormState() : m_controlStateCount(0) { }
 
-    typedef HashMap<FormElementKey, Deque<FormControlState>, FormElementKeyHash, FormElementKeyHashTraits> FormElementStateMap;
+    using FormElementStateMap = HashMap<FormElementKey, Deque<FormControlState>, FormElementKeyHash, FormElementKeyHashTraits>;
     FormElementStateMap m_stateForNewFormElements;
     size_t m_controlStateCount;
 };
@@ -306,8 +306,8 @@ public:
 private:
     FormKeyGenerator() { }
 
-    typedef WillBeHeapHashMap<RawPtrWillBeMember<HTMLFormElement>, AtomicString> FormToKeyMap;
-    typedef HashMap<String, unsigned> FormSignatureToNextIndexMap;
+    using FormToKeyMap = WillBeHeapHashMap<RawPtrWillBeMember<HTMLFormElement>, AtomicString>;
+    using FormSignatureToNextIndexMap = HashMap<String, unsigned>;
     FormToKeyMap m_formToKeyMap;
     FormSignatureToNextIndexMap m_formSignatureToNextIndexMap;
 };