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This patch aims to simplify the layout of ContentSettingBubbleContents
by adding a special View for media comboboxes and using BoxLayout for
the main content. Also includes some miscellaneous cleanup.

The visible changes of this patch are:
* The scroll view extends the full width of the dialog.
* The "?" button is the same size as versions in other dialogs.

Bug: 652031
Change-Id: If920a89eee92ff3a0343be0be07cffe1b1b6084c
Reviewed-on: https://chromium-review.googlesource.com/920747Reviewed-by: Allen Bauer <kylixrd@chromium.org>
Commit-Queue: Bret Sepulveda <bsep@chromium.org>
Cr-Commit-Position: refs/heads/master@{#537396}