Remove redundant field initialization in Java code.

content/public/android/java/src/org/chromium/content/browser/ContentViewCore.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.content.browser;
 
 import android.annotation.SuppressLint;
 import android.annotation.TargetApi;
 import android.app.assist.AssistStructure.ViewNode;
 import android.content.ClipData;
@@ skipping 265 matching lines @@
     private final Context mContext;
     private final String mProductVersion;
     private ViewGroup mContainerView;
     private InternalAccessDelegate mContainerViewInternals;
     private WebContents mWebContents;
     private WebContentsObserver mWebContentsObserver;
 
     private ContentViewClient mContentViewClient;
 
     // Native pointer to C++ ContentViewCoreImpl object which will be set by nativeInit().
-    private long mNativeContentViewCore = 0;
+    private long mNativeContentViewCore;
 
     private boolean mAttachedToWindow;
     private final ObserverList<GestureStateListener> mGestureStateListeners;
     private final RewindableIterator<GestureStateListener> mGestureStateListenersIterator;
 
     private PopupZoomer mPopupZoomer;
     private SelectPopup mSelectPopup;
-    private long mNativeSelectPopupSourceFrame = 0;
+    private long mNativeSelectPopupSourceFrame;
 
     private OverscrollRefreshHandler mOverscrollRefreshHandler;
 
-    private Runnable mFakeMouseMoveRunnable = null;
+    private Runnable mFakeMouseMoveRunnable;
 
     // Only valid when focused on a text / password field.
     private ImeAdapter mImeAdapter;
 
     // Size of the viewport in physical pixels as set from onSizeChanged.
     private int mViewportWidthPix;
     private int mViewportHeightPix;
     private int mPhysicalBackingWidthPix;
     private int mPhysicalBackingHeightPix;
     private int mTopControlsHeightPix;
@@ skipping 49 matching lines @@
 
     // Whether a touch scroll sequence is active, used to hide text selection
     // handles. Note that a scroll sequence will *always* bound a pinch
     // sequence, so this will also be true for the duration of a pinch gesture.
     private boolean mTouchScrollInProgress;
 
     // The outstanding fling start events that hasn't got fling end yet. It may be > 1 because
     // onNativeFlingStopped() is called asynchronously.
     private int mPotentiallyActiveFlingCount;
 
-    private SmartClipDataListener mSmartClipDataListener = null;
+    private SmartClipDataListener mSmartClipDataListener;
 
     /**
      * PID used to indicate an invalid render process.
      */
     // Keep in sync with the value returned from ContentViewCoreImpl::GetCurrentRendererProcessId()
     // if there is no render process.
     public static final int INVALID_RENDER_PROCESS_PID = 0;
 
     // Offsets for the events that passes through this ContentViewCore.
     private float mCurrentTouchOffsetX;
@@ skipping 2600 matching lines @@
             String textTrackTextShadow, String textTrackTextSize);
 
     private native void nativeExtractSmartClipData(long nativeContentViewCoreImpl,
             int x, int y, int w, int h);
 
     private native void nativeSetBackgroundOpaque(long nativeContentViewCoreImpl, boolean opaque);
     private native boolean nativeIsTouchDragDropEnabled(long nativeContentViewCoreImpl);
     private native void nativeOnDragEvent(long nativeContentViewCoreImpl, int action, int x, int y,
             int screenX, int screenY, String[] mimeTypes, String content);
 }