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Currently, the uninstallation dialog head text is inconsistency for the
ARC apps and extension apps. ARC apps use Uninstall, and Remove for the
shortcut only, because for the shortcut, ARC apps use the extension
apps' IDS_EXTENSION_UNINSTALL_PROMPT_HEADING. Per request from the bug,
change the head text from Remove to Uninstall, and remove the quotes.
Linux apps use Uninstall as well, so I think Uninstall sounds better.

BUG=1010303
TBR=rdevlin.cronin@chromium.org

Change-Id: I0e939943c37c295ebe2c8a73824c235420a98195
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1844756Reviewed-by: Dominick Ng <dominickn@chromium.org>
Commit-Queue: Nancy Wang <nancylingwang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#704004}