Bug 1351708 - Fix Preferences::UnregisterCallback typo for fuzzing.enabled. r=froydnj

--HG--
extra : rebase_source : 29ed27d7019c08df775c48b116dffee7e6468af4

js/xpconnect/src/XPCJSContext.cpp

@@ -1635,7 +1635,7 @@ XPCJSContext::~XPCJSContext()
                                           JS_OPTIONS_DOT_STR, this);
 
 #ifdef FUZZING
-    Preferences::UnRegisterCallback(ReloadPrefsCallback, "fuzzing.enabled", this);
+    Preferences::UnregisterCallback(ReloadPrefsCallback, "fuzzing.enabled", this);
 #endif
 }