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Whenever the Page Info bubble needs to update the number of cookies being used
on a site, it will update the text in the Page Info bubble to reflect this,
which will then trigger a layout update and reanchor the bubble. However, if
this occurs while the browser window is moving into full screen mode, the Page
Info parent window will be null and this operation will crash.

Fix by checking whether the parent window exists before trying to reanchor.
Moving into full screen will also close the Page Info bubble, so the reanchor is
unnecessary anyway - it will be correctly positioned the next time it is opened.

Bug: 773283
Change-Id: I6f7418fcc96a95b8e3f0a3276ac009cef6eda92e
Reviewed-on: https://chromium-review.googlesource.com/720579
Commit-Queue: Patti <patricialor@chromium.org>
Reviewed-by: Trent Apted <tapted@chromium.org>
Cr-Commit-Position: refs/heads/master@{#510240}