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This CL compiles PermissionInfoBarDelegate only on Android. It also
refactors the delegate subclasses to move their Create methods to
PermissionInfoBarDelegate, simplifying the PermissionsQueueController.

This refactor simplifies the work necessary to allow infobars to be
switched out for modal permission prompt dialogs by centralising the
delegate creation logic.

BUG=658125

Review-Url: https://codereview.chromium.org/2443463003
Cr-Commit-Position: refs/heads/master@{#427202}