Introduce all the plumbing for Session Storage. This mostly consists of crea...

chrome/renderer/renderer_webstoragenamespace_impl.h

 // Copyright (c) 2009 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.
 
 #ifndef CHROME_RENDERER_RENDERER_WEBSTORAGENAMESPACE_IMPL_H_
 #define CHROME_RENDERER_RENDERER_WEBSTORAGENAMESPACE_IMPL_H_
 
 #include "base/basictypes.h"
-#include "chrome/common/dom_storage_type.h"
+#include "chrome/common/dom_storage_common.h"
 #include "third_party/WebKit/WebKit/chromium/public/WebStorageNamespace.h"
 
 class RendererWebStorageNamespaceImpl : public WebKit::WebStorageNamespace {
  public:
   explicit RendererWebStorageNamespaceImpl(DOMStorageType storage_type);
   RendererWebStorageNamespaceImpl(
       DOMStorageType storage_type, int64 namespace_id);
 
   // See WebStorageNamespace.h for documentation on these functions.
   virtual ~RendererWebStorageNamespaceImpl();
   virtual WebKit::WebStorageArea* createStorageArea(
       const WebKit::WebString& origin);
   virtual WebKit::WebStorageNamespace* copy();
   virtual void close();
 
  private:
   // Used during lazy initialization of namespace_id_.
   const DOMStorageType storage_type_;
 
-  // Our namespace ID.  Lazily initialized.
+  // Our namespace ID.
   int64 namespace_id_;
-
-  // namespace_id_ should equal this iff its unitialized.
-  static const int64 kUninitializedNamespaceId = -1;
 };
 
 #endif  // CHROME_RENDERER_RENDERER_WEBSTORAGENAMESPACE_IMPL_H_