Refactor module initialization.

Source/modules/InitModules.cpp

 // Copyright (c) 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "config.h"
 #include "InitModules.h"
 
 #include "bindings/modules/v8/ModuleBindingsInitializer.h"
 #include "core/EventTypeNames.h"
 #include "core/dom/Document.h"
 #include "modules/EventModulesFactory.h"
 #include "modules/EventModulesNames.h"
 #include "modules/EventTargetModulesNames.h"
 
 namespace blink {
 
-void ModulesInitializer::initEventNames()
+void ModulesInitializer::init()
 {
-    EventNames::init();
+    ASSERT(!isInitialized());
+
+    // Strings must be initialized before calling CoreInitializer::init().
     EventNames::initModules();
-}
+    EventTargetNames::initModules();
+    Document::registerEventFactory(EventModulesFactory::create());
+    ModuleBindingsInitializer::init();
 
-void ModulesInitializer::initEventTargetNames()
-{
-    EventTargetNames::init();
-    EventTargetNames::initModules();
-}
+    CoreInitializer::init();
 
-void ModulesInitializer::registerEventFactory()
-{
-    CoreInitializer::registerEventFactory();
-    Document::registerEventFactory(EventModulesFactory::create());
-}
-
-void ModulesInitializer::initBindings()
-{
-    ModuleBindingsInitializer::init();
+    ASSERT(isInitialized());
 }
 
 } // namespace blink