Move the parsing of homepage_url" and "devtools_page" out of Extension.

chrome/common/extensions/devtools_page_handler.h

+// Copyright (c) 2012 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_COMMON_EXTENSIONS_DEVTOOLS_PAGE_HANDLER_H_

[Yoyo Zhou, 2013/01/03 01:45:55]

I think these are simple enough that it's not worth it to put each in a separate
file. I prefer Devlin's approach to put them in a common
extensions_url_handler.cc; see:
https://codereview.chromium.org/11742005/

[Joe Thomas, 2013/01/03 19:56:31]

Done. I created a manifest_url_handler.cc/h Please let me know whether you
prefer extensions_url_handler over this

+#define CHROME_COMMON_EXTENSIONS_DEVTOOLS_PAGE_HANDLER_H_
+
+#include <string>
+
+#include "chrome/common/extensions/extension.h"
+#include "chrome/common/extensions/manifest_handler.h"
+
+namespace extensions {
+
+class Extension;
+
+// Parses the "devtools_page" manifest key.
+class DevToolsPageHandler : public ManifestHandler {
+ public:
+  DevToolsPageHandler();
+  virtual ~DevToolsPageHandler();
+
+  virtual bool Parse(const base::Value* value,
+                     Extension* extension,
+                     string16* error) OVERRIDE;
+};
+
+}  // namespace extensions
+
+#endif  // CHROME_COMMON_EXTENSIONS_DEVTOOLS_PAGE_HANDLER_H_