Use correct size when calculating overflow menu for new media controls

This CL makes use of the size_ member of the MediaControlsImpl when
updating the overflow menu for modern media controls. This fixes a bug
where a video of normal size will have all controls in the overflow
menu because it thinks the size is 0x0.

Bug: 805690
Change-Id: I11dc8f991696d4771f517d6cca585b3e293bb57a
Reviewed-on: https://chromium-review.googlesource.com/886656Reviewed-by: Mounir Lamouri (slow) <mlamouri@chromium.org>
Commit-Queue: Tommy Steimel <steimel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#532897}

third_party/WebKit/Source/modules/media_controls/MediaControlsImpl.cpp

@@ -976,9 +976,8 @@ void MediaControlsImpl::UpdateOverflowMenuWanted() const {
       std::make_pair(toggle_closed_captions_button_.Get(), false),
   };
 
-  // Get the size of the media controls.
-  WebSize controls_size =
-      MediaControlElementsHelper::GetSizeOrDefault(*this, WebSize(0, 0));
+  // Current size of the media controls.
+  WebSize controls_size = size_;
 
   // The video controls are more than one row so we need to allocate vertical
   // room and hide the overlay play button if there is not enough room.