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Part 1 of 2:

This CL adds a custom layout to the ClearDataDialog and fleshes
out the part when deleting storage for a single origin.

The new custom layout includes a new warning for when deleting
app data, and changes the title and Clear button text slightly.

Bug: 1068710
Change-Id: Ia7f302fb138540b7ebd11aa1ee87bdd8447b2042
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2153147
Commit-Queue: Finnur Thorarinsson <finnur@chromium.org>
Commit-Queue: Peter Conn <peconn@chromium.org>
Auto-Submit: Finnur Thorarinsson <finnur@chromium.org>
Reviewed-by: Peter Conn <peconn@chromium.org>
Cr-Commit-Position: refs/heads/master@{#760081}