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By doing so, note that a break in a for loop is not appropriate when
not all items are cancelled. So only cancel if all items are
cancelled, etc.

Bug: 982118
Bug: 946868
Change-Id: I098eb046b9e0407493033b865ad6bb38a1ec5231
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1694281
Commit-Queue: Rob Schonberger <robsc@chromium.org>
Reviewed-by: Michael Spang <spang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#676210}