Remove redundant field initialization in Java code.

ui/android/java/src/org/chromium/ui/base/WindowAndroid.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.ui.base;
 
 import android.animation.Animator;
 import android.animation.AnimatorListenerAdapter;
 import android.annotation.SuppressLint;
 import android.annotation.TargetApi;
@@ skipping 53 matching lines @@
             mAccessibilityManager.addTouchExplorationStateChangeListener(mTouchExplorationListener);
         }
 
         void destroy() {
             mAccessibilityManager.removeTouchExplorationStateChangeListener(
                     mTouchExplorationListener);
         }
     }
 
     // Native pointer to the c++ WindowAndroid object.
-    private long mNativeWindowAndroid = 0;
+    private long mNativeWindowAndroid;
     private final VSyncMonitor mVSyncMonitor;
     private final DisplayAndroid mDisplayAndroid;
 
     // A string used as a key to store intent errors in a bundle
     static final String WINDOW_CALLBACK_ERRORS = "window_callback_errors";
 
     // Error code returned when an Intent fails to start an Activity.
     public static final int START_INTENT_FAILURE = -1;
 
     protected Context mApplicationContext;
     protected SparseArray<IntentCallback> mOutstandingIntents;
     // We use a weak reference here to prevent this from leaking in WebView.
     private WeakReference<Context> mContextRef;
 
     // Ideally, this would be a SparseArray<String>, but there's no easy way to store a
     // SparseArray<String> in a bundle during saveInstanceState(). So we use a HashMap and suppress
     // the Android lint warning "UseSparseArrays".
     protected HashMap<Integer, String> mIntentErrors;
 
     // We track all animations over content and provide a drawing placeholder for them.
     private HashSet<Animator> mAnimationsOverContent = new HashSet<>();
     private View mAnimationPlaceholderView;
 
     private ViewGroup mKeyboardAccessoryView;
 
-    protected boolean mIsKeyboardShowing = false;
+    protected boolean mIsKeyboardShowing;
 
     // System accessibility service.
     private final AccessibilityManager mAccessibilityManager;
 
     // Whether touch exploration is enabled.
     private boolean mIsTouchExplorationEnabled;
 
     // On KitKat and higher, a class that monitors the touch exploration state.
     private TouchExplorationMonitor mTouchExplorationMonitor;
 
@@ skipping 619 matching lines @@
     private native long nativeInit(int displayId);
     private native void nativeOnVSync(long nativeWindowAndroid,
                                       long vsyncTimeMicros,
                                       long vsyncPeriodMicros);
     private native void nativeOnVisibilityChanged(long nativeWindowAndroid, boolean visible);
     private native void nativeOnActivityStopped(long nativeWindowAndroid);
     private native void nativeOnActivityStarted(long nativeWindowAndroid);
     private native void nativeDestroy(long nativeWindowAndroid);
 
 }