A bunch of remaining parts of extension content verification (Reland)

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 66bded285f142f366d9bdbd584e3d71eb850dcd7..4d0956bd906bbd9fc93340cb14d509410d35435c 100644
--- a/chrome/common/extensions/extension_constants.cc
+++ b/chrome/common/extensions/extension_constants.cc
@@ -61,7 +61,11 @@ GURL GetWebstoreUpdateUrl() {
   if (cmdline->HasSwitch(switches::kAppsGalleryUpdateURL))
     return GURL(cmdline->GetSwitchValueASCII(switches::kAppsGalleryUpdateURL));
   else
-    return GURL(kGalleryUpdateHttpsUrl);
+    return GetDefaultWebstoreUpdateUrl();
+}
+
+GURL GetDefaultWebstoreUpdateUrl() {
+  return GURL(kGalleryUpdateHttpsUrl);
 }
 
 bool IsWebstoreUpdateUrl(const GURL& update_url) {