Remove redundant field initialization in Java code.

chrome/android/java/src/org/chromium/chrome/browser/tab/TabUma.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.os.SystemClock;
 
 import org.chromium.base.metrics.RecordHistogram;
 import org.chromium.chrome.browser.tabmodel.TabModel.TabSelectionType;
@@ skipping 35 matching lines @@
     // TAB_STATE_* are for TabStateTransferTime and TabTransferTarget histograms.
     // TabState defined in tools/metrics/histograms/histograms.xml.
     private static final int TAB_STATE_INITIAL = 0;
     private static final int TAB_STATE_ACTIVE = 1;
     private static final int TAB_STATE_INACTIVE = 2;
     private static final int TAB_STATE_DETACHED = 3;
     private static final int TAB_STATE_CLOSED = 4;
     private static final int TAB_STATE_MAX = TAB_STATE_CLOSED;
 
     // Counter of tab shows (as per onShow()) for all tabs.
-    private static long sAllTabsShowCount = 0;
+    private static long sAllTabsShowCount;
 
     /**
      * State in which the tab was created. This can be used in metric accounting - e.g. to
      * distinguish reasons for a tab to be restored upon first display.
      */
     public enum TabCreationState {
         LIVE_IN_FOREGROUND,
         LIVE_IN_BACKGROUND,
         FROZEN_ON_RESTORE,
         FROZEN_FOR_LAZY_LOAD,
@@ skipping 317 matching lines @@
     }
 
     private static void increaseTabShowCount() {
         sAllTabsShowCount++;
     }
 
     private static long millisecondsToMinutes(long msec) {
         return msec / 1000 / 60;
     }
 }