Remove redundant field initialization in Java code.

chrome/android/java/src/org/chromium/chrome/browser/compositor/layouts/eventfilter/GestureEventFilter.java

 // Copyright 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 package org.chromium.chrome.browser.compositor.layouts.eventfilter;
 
 import android.content.Context;
 import android.os.Handler;
 import android.view.GestureDetector;
 import android.view.MotionEvent;
 import android.view.ViewConfiguration;
 
 /**
  * Filters events that would trigger gestures like scroll and fling.
  */
 public class GestureEventFilter extends EventFilter {
     private final int mLongPressTimeoutMs;
     private final GestureDetector mDetector;
     private final GestureHandler mHandler;
     private final boolean mUseDefaultLongPress;
     private final int mScaledTouchSlop;
     private boolean mSingleInput = true;
     private boolean mInLongPress;
     private boolean mSeenFirstScrollEvent;
-    private int mButtons = 0;
+    private int mButtons;
     private LongPressRunnable mLongPressRunnable = new LongPressRunnable();
     private Handler mLongPressHandler = new Handler();
 
     /**
      * A runnable to send a delayed long press.
      */
     private class LongPressRunnable implements Runnable {
         private MotionEvent mInitialEvent;
         private boolean mIsPending;
 
@@ skipping 203 matching lines @@
         }
         mDetector.onTouchEvent(e);
 
         // Propagate the up event after any gesture events.
         if (action == MotionEvent.ACTION_UP || action == MotionEvent.ACTION_CANCEL) {
             mHandler.onUpOrCancel();
         }
         return true;
     }
 }