Remove redundant field initialization in Java code.

chrome/android/javatests/src/org/chromium/chrome/browser/externalnav/ExternalNavigationHandlerTest.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.externalnav;
 
 import android.annotation.SuppressLint;
 import android.content.Intent;
 import android.content.pm.ActivityInfo;
 import android.content.pm.PackageManager;
@@ skipping 1226 matching lines @@
         }
 
         public void setIsWithinCurrentWebappScope(boolean value) {
             mIsWithinCurrentWebappScope = value;
         }
 
         public void setCanHandleWithInstantApp(boolean value) {
             mCanHandleWithInstantApp = value;
         }
 
-        public Intent startActivityIntent = null;
-        public boolean startIncognitoIntentCalled = false;
+        public Intent startActivityIntent;
+        public boolean startIncognitoIntentCalled;
 
         // This should not be reset for every run of check().
         private Boolean mQueryIntentOverride;
 
         private String mNewUrlAfterClobbering;
         private String mReferrerUrlForClobbering;
         private boolean mCanHandleWithInstantApp;
         public boolean mIsChromeAppInForeground = true;
         public boolean mIsWithinCurrentWebappScope;
 
@@ skipping 149 matching lines @@
             return new TestPackageManager();
         }
 
         @Override
         public String getPackageName() {
             return "test.app.name";
         }
 
     }
 }