Convert FullscreenController to use WebCallbacks

third_party/WebKit/Source/web/WebViewImpl.h

Index: third_party/WebKit/Source/web/WebViewImpl.h
diff --git a/third_party/WebKit/Source/web/WebViewImpl.h b/third_party/WebKit/Source/web/WebViewImpl.h
index 9590b6379d7cb536c31b3b88a9273b844397dd88..fff07794ed5c6059b00c2e5b74db671e4184b91c 100644
--- a/third_party/WebKit/Source/web/WebViewImpl.h
+++ b/third_party/WebKit/Source/web/WebViewImpl.h
@@ -75,6 +75,7 @@ class BrowserControls;
 class DataObject;
 class DevToolsEmulator;
 class Frame;
+class FullscreenCallbacks;
 class FullscreenController;
 class InspectorOverlay;
 class LinkHighlightImpl;
@@ -447,8 +448,8 @@ class WEB_EXPORT WebViewImpl final
     return m_fakePageScaleAnimationUseAnchor;
   }
 
-  void enterFullscreenForElement(Element*);
-  void exitFullscreen(LocalFrame*);
+  void enterFullscreen(LocalFrame&, std::unique_ptr<FullscreenCallbacks>);
+  void exitFullscreen(LocalFrame&);
   void fullscreenElementChanged(Element*, Element*);
 
   // Exposed for the purpose of overriding device metrics.
@@ -699,7 +700,7 @@ class WEB_EXPORT WebViewImpl final
   WebGestureDevice m_flingSourceDevice;
   Vector<std::unique_ptr<LinkHighlightImpl>> m_linkHighlights;
   std::unique_ptr<CompositorAnimationTimeline> m_linkHighlightsTimeline;
-  Persistent<FullscreenController> m_fullscreenController;
+  std::unique_ptr<FullscreenController> m_fullscreenController;
 
   WebColor m_baseBackgroundColor;
   WebColor m_backgroundColorOverride;