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settings in the content settings bubble.

The reload infobar is no longer displayed when the media stream content settings
change. Instead, a small hint is displayed in the bubble when it is re-opened
after changing a media stream setting.

This hint is always displayed when the camera/microphone permission changes.
When the media device preference changes, the hint is only displayed if there
was at least one active media capture.

Also added a bunch of tests for the media menu because they had no test coverage.

BUG=405522
TEST=ContentSettingBubbleModelTest.*Media*

Review URL: https://codereview.chromium.org/588153003

Cr-Commit-Position: refs/heads/master@{#296913}