Special case the gallery to not show the scary download roadblock.

chrome/common/extensions/extension_constants.cc

 // 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.
 
 #include "chrome/common/extensions/extension_constants.h"
 
 namespace extension_manifest_keys {
 
 const wchar_t* kBackground = L"background_page";
 const wchar_t* kBrowserAction = L"browser_action";
@@ skipping 177 matching lines @@
     "Default locale is defined but default data couldn't be loaded.";
 const char* kLocalesNoValidLocaleNamesListed =
     "No valid locale name could be found in _locales directory.";
 const char* kLocalesTreeMissing =
     "Default locale was specified, but _locales subtree is missing.";
 const char* kLocalesMessagesFileMissing =
     "Messages file is missing for locale.";
 const char* kInvalidOptionsPage =
     "Invalid value for 'options_page'.";
 }  // namespace extension_manifest_errors
+
+namespace extension_urls {
+const char* kGalleryBrowsePrefix = "https://chrome.google.com/extensions";
+const char* kGalleryDownloadPrefix =
+    "https://clients2.googleusercontent.com/crx/download";
+const char* kMiniGalleryBrowsePrefix = "https://tools.google.com/chrome/";
+const char* kMiniGalleryDownloadPrefix = "https://dl-ssl.google.com/chrome/";
+}