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This change allows web apps that are populated in chrome://apps using
WebAppProvider to be uninstalled.

R=loyso@chromium.org

Tested: Manually, with both BMO on and off.
Bug: 1009302, 1068476
Change-Id: Ia80a546d4cff8c999ff2bc7a7541e672ce2b4e11
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2117298Reviewed-by: calamity <calamity@chromium.org>
Reviewed-by: Alexey Baskakov <loyso@chromium.org>
Commit-Queue: Daniel Murphy <dmurph@chromium.org>
Cr-Commit-Position: refs/heads/master@{#757947}