Fix "Get more extensions" link in about:extensions.

chrome/common/extensions/extension_constants.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_EXTENSION_CONSTANTS_H_
 #define CHROME_COMMON_EXTENSIONS_EXTENSION_CONSTANTS_H_
 
 #include <string>
 
 #include "base/basictypes.h"
 #include "googleurl/src/gurl.h"
 
 namespace extension_urls {
   // 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 to the extensions category on the Web Store. This is
+  // derived from GetWebstoreLaunchURL().
+  std::string GetExtensionGalleryURL();
+
   // 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();
 
   // Returns the URL leading to a search page for Web Intents. The search is
   // specific to intents with the given |action| and |type|.
   GURL GetWebstoreIntentQueryURL(const std::string& action,
                                  const std::string& type);
 
@@ skipping 242 matching lines @@
   extern const int kExtensionActionIconSizes[];
   extern const size_t kNumExtensionActionIconSizes;
 
   // List of sizes for extension icons that can be defined in the manifest.
   extern const int kScriptBadgeIconSizes[];
   extern const size_t kNumScriptBadgeIconSizes;
 
 }  // extension_misc
 
 #endif  // CHROME_COMMON_EXTENSIONS_EXTENSION_CONSTANTS_H_