Clean up WebVR RequestPresent and make callback asynchronous.

chrome/android/javatests/src/org/chromium/chrome/browser/vr_shell/VrShellTest.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.chrome.browser.vr_shell;
 
 import static org.chromium.chrome.test.util.ChromeRestriction.RESTRICTION_TYPE_DAYDREAM;
 import static org.chromium.chrome.test.util.ChromeRestriction.RESTRICTION_TYPE_NON_DAYDREAM;
 
 import android.os.SystemClock;
@@ skipping 17 matching lines @@
 
     @Override
     public void startMainActivity() throws InterruptedException {
         startMainActivityOnBlankPage();
     }
 
     private void forceEnterVr() {
         ThreadUtils.runOnUiThreadBlocking(new Runnable() {
             @Override
             public void run() {
-                mDelegate.enterVRIfNecessary(false);
+                mDelegate.enterVRIfNecessary();
             }
         });
     }
 
     private void forceExitVr() {
         ThreadUtils.runOnUiThreadBlocking(new Runnable() {
             @Override
             public void run() {
                 mDelegate.exitVRIfNecessary(false);
             }
@@ skipping 25 matching lines @@
 
     /**
      * Verifies that browser does not enter VR mode on Non-Daydream-ready devices.
      */
     @Restriction(RESTRICTION_TYPE_NON_DAYDREAM)
     @MediumTest
     public void testEnterExitVrModeUnsupported() {
         testEnterExitVrMode(false);
     }
 }