Modernize coding style in core/html/forms/.

Source/core/html/forms/FormController.h

Index: Source/core/html/forms/FormController.h
diff --git a/Source/core/html/forms/FormController.h b/Source/core/html/forms/FormController.h
index acad5dbc9c3f26e0b993d279c2336cb768cbe7e6..74e853dee1642d49eab8cb2f8231eeefa11ebd3a 100644
--- a/Source/core/html/forms/FormController.h
+++ b/Source/core/html/forms/FormController.h
@@ -71,7 +71,7 @@ inline void FormControlState::append(const String& value)
     m_values.append(value);
 }
 
-typedef HashMap<AtomicString, OwnPtr<SavedFormState>> SavedFormStateMap;
+using SavedFormStateMap = HashMap<AtomicString, OwnPtr<SavedFormState>>;
 
 class DocumentState final : public RefCountedWillBeGarbageCollected<DocumentState> {
     DECLARE_EMPTY_DESTRUCTOR_WILL_BE_REMOVED(DocumentState);
@@ -84,7 +84,7 @@ public:
     Vector<String> toStateVector();
 
 private:
-    typedef WillBeHeapListHashSet<RefPtrWillBeMember<HTMLFormControlElementWithState>, 64> FormElementListHashSet;
+    using FormElementListHashSet = WillBeHeapListHashSet<RefPtrWillBeMember<HTMLFormControlElementWithState>, 64>;
     FormElementListHashSet m_formControls;
 };