Remove UserGestureUtilizedCallback, it's unused outside of tests

third_party/WebKit/Source/core/dom/Fullscreen.cpp

Index: third_party/WebKit/Source/core/dom/Fullscreen.cpp
diff --git a/third_party/WebKit/Source/core/dom/Fullscreen.cpp b/third_party/WebKit/Source/core/dom/Fullscreen.cpp
index 144e568ae4b443bbd17699e86701aee6522ebb17..f0e48fbf779f72f15e131b0357344568cdd7f096 100644
--- a/third_party/WebKit/Source/core/dom/Fullscreen.cpp
+++ b/third_party/WebKit/Source/core/dom/Fullscreen.cpp
@@ -90,7 +90,7 @@ bool AllowedToRequestFullscreen(Document& document) {
   // true:
 
   //  The algorithm is triggered by a user activation.
-  if (UserGestureIndicator::UtilizeUserGesture())
+  if (UserGestureIndicator::ProcessingUserGesture())
     return true;
 
   //  The algorithm is triggered by a user generated orientation change.