Remove redundant field initialization in Java code.

content/public/android/java/src/org/chromium/content/browser/InterfaceRegistrarImpl.java

 // Copyright 2016 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.content.Context;
 
 import org.chromium.base.annotations.CalledByNative;
 import org.chromium.base.annotations.JNINamespace;
@@ skipping 30 matching lines @@
     }
 
     private static void ensureContentRegistrarsAreRegistered() {
         if (sHasRegisteredRegistrars) return;
         sHasRegisteredRegistrars = true;
         InterfaceRegistrar.Registry.addContextRegistrar(new ContentContextInterfaceRegistrar());
         InterfaceRegistrar.Registry.addWebContentsRegistrar(
                 new ContentWebContentsInterfaceRegistrar());
     }
 
-    private static boolean sHasRegisteredRegistrars = false;
+    private static boolean sHasRegisteredRegistrars;
 }
 
 class ContentContextInterfaceRegistrar implements InterfaceRegistrar<Context> {
     @Override
     public void registerInterfaces(InterfaceRegistry registry, final Context applicationContext) {
         registry.addInterface(
                 VibrationManager.MANAGER, new VibrationManagerImpl.Factory(applicationContext));
         registry.addInterface(
                 BatteryMonitor.MANAGER, new BatteryMonitorFactory(applicationContext));
         registry.addInterface(
                 FaceDetection.MANAGER, new FaceDetectionFactory(applicationContext));
         // TODO(avayvod): Register the PresentationService implementation here.
     }
 }
 
 class ContentWebContentsInterfaceRegistrar implements InterfaceRegistrar<WebContents> {
     @Override
     public void registerInterfaces(InterfaceRegistry registry, final WebContents webContents) {
         registry.addInterface(Nfc.MANAGER, new NfcFactory(webContents));
     }
 }