Remove redundant field initialization in Java code.

chrome/android/java/src/org/chromium/chrome/browser/toolbar/ActionModeController.java

 // Copyright 2015 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.toolbar;
 
 import android.animation.Animator;
 import android.animation.AnimatorListenerAdapter;
 import android.animation.ObjectAnimator;
 import android.animation.ValueAnimator;
 import android.content.Context;
 import android.content.res.TypedArray;
 import android.support.v7.app.ActionBar;
 import android.util.Property;
 
 import org.chromium.chrome.R;
 
 /**
  * This class controls the how toolbar animates while the action mode bar is being shown. It also
  * manages a {@link ToolbarActionModeCallback}.
  */
 public class ActionModeController {
 
     private static final int SLIDE_DURATION_MS = 200;
 
     private ToolbarActionModeCallback mToolbarActionModeCallback;
-    private ObjectAnimator mCurrentAnimation = null;
-    private boolean mShowingActionMode = false;
+    private ObjectAnimator mCurrentAnimation;
+    private boolean mShowingActionMode;
     private float mTabStripHeight;
     private final Context mContext;
     private final ActionBarDelegate mActionBarDelegate;
 
     /** Property for animating the top margin of ActionBarDelegate. */
     public static final Property<ActionBarDelegate, Integer> TOP_MARGIN_ANIM_PROPERTY =
             new Property<ActionBarDelegate, Integer>(Integer.class, "controlTopMargin") {
                 @Override
                 public Integer get(ActionBarDelegate delegate) {
                     return delegate.getControlTopMargin();
@@ skipping 145 matching lines @@
             public void onAnimationEnd(Animator animation) {
                 mCurrentAnimation = null;
                 mActionBarDelegate.setActionBarBackgroundVisibility(false);
             }
         });
 
         mCurrentAnimation.start();
         mShowingActionMode = false;
     }
 }