Bug 1426977 P5 Remove unnused cookie pref getters from nsContentUtils. r=mystor

dom/base/nsContentUtils.h

@@ -2913,16 +2913,6 @@ public:
 
   static bool IsNonSubresourceRequest(nsIChannel* aChannel);
 
-  static uint32_t CookiesBehavior()
-  {
-    return sCookiesBehavior;
-  }
-
-  static uint32_t CookiesLifetimePolicy()
-  {
-    return sCookiesLifetimePolicy;
-  }
-
   // The order of these entries matters, as we use std::min for total ordering
   // of permissions. Private Browsing is considered to be more limiting
   // then session scoping