Remove redundant field initialization in Java code.

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

 // Copyright 2013 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.view.MotionEvent;
 
 import java.util.Arrays;
 
 /**
  * A {@link CascadeEventFilter} delegates all the events coming its way to another filter.
  */
 public class CascadeEventFilter extends EventFilter {
     private EventFilter[] mDelegates;
-    private EventFilter mActiveDelegate = null;
+    private EventFilter mActiveDelegate;
 
     /**
      * Creates a {@link CascadeEventFilter}.
      *
      * The delegates will be queried in the order specified in this list (0 -> count). Once a
      * delegate takes ownership of the event by returning {@code true} from
      * {@link EventFilter#onInterceptTouchEventInternal(MotionEvent, boolean)} it will get all
      * subsequent events for the same gesture to
      * {@link EventFilter#onTouchEventInternal(MotionEvent)}.
      *
@@ skipping 27 matching lines @@
     public boolean onTouchEventInternal(MotionEvent e) {
         if (mActiveDelegate != null) {
             if (mActiveDelegate.autoOffsetEvents()) {
                 e.offsetLocation(mCurrentTouchOffsetX, mCurrentTouchOffsetY);
             }
             return mActiveDelegate.onTouchEventInternal(e);
         }
         return false;
     }
 }