Make Fullscreen::requestFullscreen and exitFullscreen static

third_party/WebKit/Source/core/html/HTMLMediaElement.cpp

Index: third_party/WebKit/Source/core/html/HTMLMediaElement.cpp
diff --git a/third_party/WebKit/Source/core/html/HTMLMediaElement.cpp b/third_party/WebKit/Source/core/html/HTMLMediaElement.cpp
index 30af245cf3d411a084b0fa52267bdf23303d3786..bd2144dfb9b901bed5592bb9e21165eedb07f9da 100644
--- a/third_party/WebKit/Source/core/html/HTMLMediaElement.cpp
+++ b/third_party/WebKit/Source/core/html/HTMLMediaElement.cpp
@@ -3294,14 +3294,14 @@ void HTMLMediaElement::enterFullscreen()
 {
     BLINK_MEDIA_LOG << "enterFullscreen(" << (void*)this << ")";
 
-    Fullscreen::from(document()).requestFullscreen(*this, Fullscreen::PrefixedRequest);
+    Fullscreen::requestFullscreen(*this, Fullscreen::PrefixedRequest);
 }
 
 void HTMLMediaElement::exitFullscreen()
 {
     BLINK_MEDIA_LOG << "exitFullscreen(" << (void*)this << ")";
 
-    Fullscreen::from(document()).exitFullscreen();
+    Fullscreen::exitFullscreen(document());
 }
 
 void HTMLMediaElement::didBecomeFullscreenElement()