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Previously: when multiple permissions were requested, they could only
be toggled individually if the user clicked on "Customize."

Now: the bubble will always allow for customization if there are
multiple permissions in the request. it will be the default state.

BUG=440563

Review URL: https://codereview.chromium.org/885373004

Cr-Commit-Position: refs/heads/master@{#314731}