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Currently, we reset the media ID associated with Picture-in-Picture
when OnMediaDestroyed is called, which includes when the video stops
playing. This causes crashes when we attempt to control the video from
the Picture-in-Picture window, such as play/pause and close.

This also means that even if we leave Picture-in-Picture mode, the
video media player will still show the Picture-in-Picture interstitial
because the WebMediaPlayer isn't updated with the fact we've left
Picture-in-Picture mode.

It is okay to keep the id around; when another video is PiP'd, the ID
will be updated.

BUG: 726619
Change-Id: I0e665047b85f20bc7bb9795273a5640460e7612f
Reviewed-on: https://chromium-review.googlesource.com/1026974Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Commit-Queue: apacible <apacible@chromium.org>
Cr-Commit-Position: refs/heads/master@{#553723}