Bug 1548253 - Port pref cache variables of nsContentUtils to StaticPrefs - dom.enable_frame_timing, r=Ehsan

Differential Revision: https://phabricator.services.mozilla.com/D29509

--HG--
extra : moz-landing-system : lando

dom/base/nsContentUtils.cpp

@@ -310,7 +310,6 @@ nsString* nsContentUtils::sAltText = nullptr;
 nsString* nsContentUtils::sModifierSeparator = nullptr;
 
 bool nsContentUtils::sInitialized = false;
-bool nsContentUtils::sIsFrameTimingPrefEnabled = false;
 bool nsContentUtils::sIsFormAutofillAutocompleteEnabled = false;
 bool nsContentUtils::sSendPerformanceTimingNotifications = false;
 bool nsContentUtils::sUseActivityCursor = false;
@@ -625,9 +624,6 @@ nsresult nsContentUtils::Init() {
   Preferences::AddBoolVarCache(&sAllowXULXBL_for_file,
                                "dom.allow_XUL_XBL_for_file");
 
-  Preferences::AddBoolVarCache(&sIsFrameTimingPrefEnabled,
-                               "dom.enable_frame_timing", false);
-
   Preferences::AddBoolVarCache(&sIsFormAutofillAutocompleteEnabled,
                                "dom.forms.autocomplete.formautofill", false);
 
@@ -6665,11 +6661,6 @@ bool nsContentUtils::IsCutCopyAllowed(nsIPrincipal* aSubjectPrincipal) {
   return PrincipalHasPermission(aSubjectPrincipal, nsGkAtoms::clipboardWrite);
 }
 
-/* static */
-bool nsContentUtils::IsFrameTimingEnabled() {
-  return sIsFrameTimingPrefEnabled;
-}
-
 /* static */
 bool nsContentUtils::HaveEqualPrincipals(Document* aDoc1, Document* aDoc2) {
   if (!aDoc1 || !aDoc2) {

dom/base/nsContentUtils.h

@@ -2347,11 +2347,6 @@ class nsContentUtils {
     return sSendPerformanceTimingNotifications;
   }
 
-  /*
-   * Returns true if the frame timing APIs are enabled.
-   */
-  static bool IsFrameTimingEnabled();
-
   /*
    * Returns true if the browser should attempt to prevent the given caller type
    * from collecting distinctive information about the browser that could
@@ -3466,7 +3461,6 @@ class nsContentUtils {
   static bool sIsHandlingKeyBoardEvent;
   static bool sAllowXULXBL_for_file;
   static uint32_t sHandlingInputTimeout;
-  static bool sIsFrameTimingPrefEnabled;
   static bool sIsFormAutofillAutocompleteEnabled;
   static bool sSendPerformanceTimingNotifications;
   static bool sUseActivityCursor;