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Introduce a TestBookmarkAppUninstaller and use that in
PendingBookmarkAppManager unit tests. This allows us to get rid of
almost all the extensions code from PendingBookmarkAppManager unit tests
(ExtensionIdsMap is the only extensions-related concept in tests).

Also adds unit tests for BookmarkAppUninstaller that were previously
part of PendingBookmarkAppManager tests.

Bug: 916381
Change-Id: Idab844a6213e27bc5a0018a035df57ad1a5904f4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1522049
Commit-Queue: Giovanni Ortuño Urquidi <ortuno@chromium.org>
Reviewed-by: Alexey Baskakov <loyso@chromium.org>
Cr-Commit-Position: refs/heads/master@{#642272}