Remove redundant field initialization in Java code.

chrome/android/java/src/org/chromium/chrome/browser/tab/TabWebContentsDelegateAndroid.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.tab;
 
 import android.annotation.TargetApi;
 import android.app.Activity;
 import android.app.ActivityManager;
 import android.content.Context;
@@ skipping 55 matching lines @@
         public void onFindMatchRects(FindMatchRectsDetails result);
     }
 
     /** Used for logging. */
     private static final String TAG = "WebContentsDelegate";
 
     protected final Tab mTab;
 
     private FindResultListener mFindResultListener;
 
-    private FindMatchRectsListener mFindMatchRectsListener = null;
+    private FindMatchRectsListener mFindMatchRectsListener;
 
     private int mDisplayMode = WebDisplayMode.Browser;
 
     protected Handler mHandler;
 
     private final Runnable mCloseContentsRunnable = new Runnable() {
         @Override
         public void run() {
             boolean isSelected = mTab.getTabModelSelector().getCurrentTab() == mTab;
             mTab.getTabModelSelector().closeTab(mTab);
@@ skipping 440 matching lines @@
         };
     }
 
     private static native void nativeOnRendererUnresponsive(WebContents webContents);
     private static native void nativeOnRendererResponsive(WebContents webContents);
     private static native boolean nativeIsCapturingAudio(WebContents webContents);
     private static native boolean nativeIsCapturingVideo(WebContents webContents);
     private static native boolean nativeIsCapturingScreen(WebContents webContents);
     private static native void nativeNotifyStopped(WebContents webContents);
 }