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AppUninstallDialogView replaced ExtensionUninstaller, so
ExtensionUninstaller can be removed.
https://cs.chromium.org/chromium/src/chrome/browser/ui/views/apps/app_uninstall_dialog_view.h?l=44

BUG=1010303

Change-Id: I215dad0977b2d37bc126ac68e06689eb0a3b0c3e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2076857Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Commit-Queue: Nancy Wang <nancylingwang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#745216}