Bug 1570212 - Convert dom.allow_XUL_XBL_for_file to a static pref. r=mccr8

Differential Revision: https://phabricator.services.mozilla.com/D40153

dom/base/nsContentUtils.cpp

@@ -307,7 +307,6 @@ uint32_t nsContentUtils::sRunnersCountAtFirstBlocker = 0;
 nsIInterfaceRequestor* nsContentUtils::sSameOriginChecker = nullptr;
 
 bool nsContentUtils::sIsHandlingKeyBoardEvent = false;
-bool nsContentUtils::sAllowXULXBL_for_file = false;
 
 nsString* nsContentUtils::sShiftText = nullptr;
 nsString* nsContentUtils::sControlText = nullptr;
@@ -621,9 +620,6 @@ nsresult nsContentUtils::Init() {
 
   sBlockedScriptRunners = new AutoTArray<nsCOMPtr<nsIRunnable>, 8>;
 
-  Preferences::AddBoolVarCache(&sAllowXULXBL_for_file,
-                               "dom.allow_XUL_XBL_for_file");
-
 #ifndef RELEASE_OR_BETA
   sBypassCSSOMOriginCheck = getenv("MOZ_BYPASS_CSSOM_ORIGIN_CHECK");
 #endif
@@ -6235,7 +6231,8 @@ bool nsContentUtils::AllowXULXBLForPrincipal(nsIPrincipal* aPrincipal) {
   aPrincipal->GetURI(getter_AddRefs(princURI));
 
   return princURI &&
-         ((sAllowXULXBL_for_file && SchemeIs(princURI, "file")) ||
+         ((StaticPrefs::dom_allow_XUL_XBL_for_file() &&
+           SchemeIs(princURI, "file")) ||
           IsSitePermAllow(aPrincipal, NS_LITERAL_CSTRING("allowXULXBL")));
 }
 

dom/base/nsContentUtils.h

@@ -3236,7 +3236,6 @@ class nsContentUtils {
   static nsIInterfaceRequestor* sSameOriginChecker;
 
   static bool sIsHandlingKeyBoardEvent;
-  static bool sAllowXULXBL_for_file;
 #ifndef RELEASE_OR_BETA
   static bool sBypassCSSOMOriginCheck;
 #endif

modules/libpref/init/StaticPrefList.yaml

@@ -1126,6 +1126,11 @@
   value: true
   mirror: always
 
+- name: dom.allow_XUL_XBL_for_file
+  type: bool
+  value: false
+  mirror: always
+
 # Is support for automatically removing replaced filling animations enabled?
 - name: dom.animations-api.autoremove.enabled
   type: bool