Move GetWebstoreLaunchURL and GetWebstoreItemDetailURLPrefix to extensions/common/extension_urls.h.

extensions/common/extension_urls.h

 // Copyright 2013 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 EXTENSIONS_COMMON_EXTENSION_URLS_H_
 #define EXTENSIONS_COMMON_EXTENSION_URLS_H_
 
 #include "base/strings/string16.h"
 
 namespace extensions {
 
 // The name of the event_bindings module.
 extern const char kEventBindings[];
 
 // The name of the schemaUtils module.
 extern const char kSchemaUtils[];
 
 // Determine whether or not a source came from an extension. |source| can link
 // to a page or a script, and can be external (e.g., "http://www.google.com"),
 // extension-related (e.g., "chrome-extension://<extension_id>/background.js"),
 // or internal (e.g., "event_bindings" or "schemaUtils").
 bool IsSourceFromAnExtension(const base::string16& source);
 
+// Returns the URL prefix for the extension/apps gallery. Can be set via the
+// --apps-gallery-url switch. The URL returned will not contain a trailing
+// slash. Do not use this as a prefix/extent for the store.
+std::string GetWebstoreLaunchURL();
+
+// Returns the URL prefix for an item in the extension/app gallery. This URL
+// will contain a trailing slash and should be concatenated with an item ID
+// to get the item detail URL.
+std::string GetWebstoreItemDetailURLPrefix();
+
 }  // namespace extensions
 
 #endif  // EXTENSIONS_COMMON_EXTENSION_URLS_H_