Fix fullscreen elements in pinch viewport mode.

Source/web/FullscreenController.cpp

Index: Source/web/FullscreenController.cpp
diff --git a/Source/web/FullscreenController.cpp b/Source/web/FullscreenController.cpp
index e16af27be5dd23f69bd324e115ca684d1abf0c3a..ccd6f8142e816734e8057aeeca956d290730b136 100644
--- a/Source/web/FullscreenController.cpp
+++ b/Source/web/FullscreenController.cpp
@@ -158,6 +158,14 @@ void FullscreenController::exitFullScreenForElement(Element* element)
         client->exitFullScreen();
 }
 
+void FullscreenController::updateSize()
+{
+    if (!isFullscreen())
+        return;
+
+    Fullscreen::from(*m_fullScreenFrame->document()).fullScreenRenderer()->updateStyle();
+}
+
 void FullscreenController::trace(Visitor* visitor)
 {
     visitor->trace(m_provisionalFullScreenElement);