Add a requestFullscreen variant with a default (prefixed) type

third_party/WebKit/Source/modules/vr/VRDisplay.cpp

 // 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.
 
 #include "modules/vr/VRDisplay.h"
 
 #include "core/css/StylePropertySet.h"
 #include "core/dom/DOMException.h"
 #include "core/dom/DocumentUserGestureToken.h"
 #include "core/dom/FrameRequestCallback.h"
@@ skipping 472 matching lines @@
       m_fullscreenOrigHeight = String();
     }
 
     if (doc) {
       // Since the callback for requestPresent is asynchronous, we've lost our
       // UserGestureToken, and need to create a new one to enter fullscreen.
       gestureIndicator = WTF::wrapUnique(
           new UserGestureIndicator(DocumentUserGestureToken::create(
               doc, UserGestureToken::Status::PossiblyExistingGesture)));
     }
-    Fullscreen::requestFullscreen(*canvas, Fullscreen::UnprefixedRequest);
+    Fullscreen::requestFullscreen(*canvas);
 
     // Check to see if the canvas is still the current fullscreen
     // element once every 2 seconds.
     m_fullscreenCheckTimer.startRepeating(2.0, BLINK_FROM_HERE);
     m_reenteredFullscreen = false;
   }
 
   if (doc) {
     Platform::current()->recordRapporURL("VR.WebVR.PresentSuccess",
                                          WebURL(doc->url()));
@@ skipping 217 matching lines @@
     }
     m_reenteredFullscreen = true;
     auto canvas = m_layer.source();
     Document* doc = this->document();
     std::unique_ptr<UserGestureIndicator> gestureIndicator;
     if (doc) {
       gestureIndicator = WTF::wrapUnique(
           new UserGestureIndicator(DocumentUserGestureToken::create(
               doc, UserGestureToken::Status::PossiblyExistingGesture)));
     }
-    Fullscreen::requestFullscreen(*canvas, Fullscreen::UnprefixedRequest);
+    Fullscreen::requestFullscreen(*canvas);
   }
 }
 
 ScriptedAnimationController& VRDisplay::ensureScriptedAnimationController(
     Document* doc) {
   if (!m_scriptedAnimationController)
     m_scriptedAnimationController = ScriptedAnimationController::create(doc);
 
   return *m_scriptedAnimationController;
 }
@@ skipping 28 matching lines @@
   visitor->trace(m_stageParameters);
   visitor->trace(m_eyeParametersLeft);
   visitor->trace(m_eyeParametersRight);
   visitor->trace(m_layer);
   visitor->trace(m_renderingContext);
   visitor->trace(m_scriptedAnimationController);
   visitor->trace(m_pendingPresentResolvers);
 }
 
 }  // namespace blink