Bug 1352993 - Part 0, remove useless variable r=sebastian

No one is using this variable, remove it.

MozReview-Commit-ID: LLcxoh4mRrE

--HG--
extra : rebase_source : e9b418c8adefa8459e04b3ad65e17e376a9369ad

mobile/android/base/java/org/mozilla/gecko/ActionBarTextSelection.java

@@ -30,8 +30,6 @@ class ActionBarTextSelection implements TextSelection, BundleEventListener {
 
     private final Context context;
 
-    private boolean mDraggingHandles;
-
     private int selectionID; // Unique ID provided for each selection action.
 
     private GeckoBundle[] mCurrentItems;