Disallow syncing of extensions with third-party update URLs or plugins.

chrome/common/extensions/extension_constants.cc

Index: chrome/common/extensions/extension_constants.cc
diff --git a/chrome/common/extensions/extension_constants.cc b/chrome/common/extensions/extension_constants.cc
index 8bfa434cb08c50e95bb7cc47bd2f4e7aa647ffee..989d44980201d5f07c4d41359146edd9586981fd 100644
--- a/chrome/common/extensions/extension_constants.cc
+++ b/chrome/common/extensions/extension_constants.cc
@@ -263,8 +263,10 @@ namespace extension_urls {
 const char* kGalleryBrowsePrefix = "https://chrome.google.com/extensions";
 const char* kGalleryDownloadPrefix =
     "https://clients2.googleusercontent.com/crx/download";
-const char* kGalleryUpdateURL =
+const char* kGalleryUpdateHttpUrl =
     "http://clients2.google.com/service/update2/crx";
+const char* kGalleryUpdateHttpsUrl =
+    "https://clients2.google.com/service/update2/crx";
 const char* kMiniGalleryBrowsePrefix = "https://tools.google.com/chrome/";
 const char* kMiniGalleryDownloadPrefix = "https://dl-ssl.google.com/chrome/";
 }