Bug 1157526 - (Part 5) Remove unused toast method. r=mcomella

--HG--
extra : commitid : BhNskWKqnkf
extra : rebase_source : fd6c467c21eefb6608081a2419f85ce4ba6d6ecc
extra : histedit_source : c8bf324e3c41baa2f24f2bce1ba1f6a8ad2721ec

mobile/android/base/GeckoApp.java

@@ -833,15 +833,6 @@ public abstract class GeckoApp
         });
     }
 
-    public void showToast(final int resId, final int duration) {
-        ThreadUtils.postToUiThread(new Runnable() {
-            @Override
-            public void run() {
-                Toast.makeText(GeckoApp.this, resId, duration).show();
-            }
-        });
-    }
-
     public void showNormalToast(final String message, final String duration) {
         ThreadUtils.postToUiThread(new Runnable() {
             @Override