Bug 1522412 - P2. Remove nsIChannel.LOAD_CLASSIFY_URI flag. r=Ehsan

nsIChannel.LOAD_CLASSIFY_URI is no longer required so we can remove it from
the codebase.
In the mean time, we add a new LOAD_BYPASS_URL_CLASSIFIER load flag for
channel creator to be able to force channel to bypass URL classifier check.
The use of the new LOAD_BYPASS_URL_CLASSIFIER flag will be addressed in
the other patches.

Differential Revision: https://phabricator.services.mozilla.com/D22111

dom/script/ScriptLoader.cpp

@@ -1264,8 +1264,7 @@ nsresult ScriptLoader::StartLoad(ScriptLoadRequest* aRequest) {
       getter_AddRefs(channel), aRequest->mURI, context,
       aRequest->TriggeringPrincipal(), securityFlags, contentPolicyType,
       nullptr,  // aPerformanceStorage
-      loadGroup, prompter,
-      nsIRequest::LOAD_NORMAL | nsIChannel::LOAD_CLASSIFY_URI);
+      loadGroup, prompter);
 
   NS_ENSURE_SUCCESS(rv, rv);