Remove redundant field initialization in Java code.

chrome/android/java/src/org/chromium/chrome/browser/toolbar/ToolbarPhone.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.AnimatorSet;
 import android.animation.ObjectAnimator;
@@ skipping 135 matching lines @@
 
     private ColorDrawable mTabSwitcherAnimationBgOverlay;
     private TabSwitcherDrawable mTabSwitcherAnimationTabStackDrawable;
     private Drawable mTabSwitcherAnimationMenuDrawable;
     private Drawable mTabSwitcherAnimationMenuBadgeDarkDrawable;
     private Drawable mTabSwitcherAnimationMenuBadgeLightDrawable;
     // Value that determines the amount of transition from the normal toolbar mode to TabSwitcher
     // mode.  0 = entirely in normal mode and 1.0 = entirely in TabSwitcher mode.  In between values
     // can be used for animating between the two view modes.
     @ViewDebug.ExportedProperty(category = "chrome")
-    private float mTabSwitcherModePercent = 0;
+    private float mTabSwitcherModePercent;
 
     // Used to clip the toolbar during the fade transition into and out of TabSwitcher mode.  Only
     // used when |mAnimateNormalToolbar| is false.
     @ViewDebug.ExportedProperty(category = "chrome")
     private Rect mClipRect;
 
     private OnClickListener mTabSwitcherListener;
     private OnClickListener mNewTabListener;
 
     @ViewDebug.ExportedProperty(category = "chrome")
@@ skipping 2071 matching lines @@
         });
 
         if (mControlsVisibilityDelegate != null) {
             mFullscreenCalloutToken =
                     mControlsVisibilityDelegate.showControlsPersistentAndClearOldToken(
                             mFullscreenCalloutToken);
         }
     }
 }