Right clicking video produces varying context menus.

[tdrews]

Sometimes right clicking on the video produces one context menu, showing "Loop, Show controls, ...", and other times it produces another, showing "Back, Forward, ...".

Expected: only the "Loop, Show controls, ..." context menu is shown.

Mirrored from http://crbug.com/609879

[joeyparrish]

When the context menu shows "Back, Forward", selecting "Inspect" reveals the cause: the cursor is on element ID giantPlayButtonContainer instead of video.

The actual button (ID giantPlayButton) has the style display: none, but its container has display: block, which is why the container is receiving those clicks. We should be able to fix it by hiding the container.