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This CL changes StoragePartition to wait for localstorage deletions
to finish before calling its callback.

Some extension tests can leak memory because they don't wait until
StorageParitition deletions are finished. This CL adds a method to
StoragePartition to check if it is done and changes extension tests
to always wait for StoragePartition.

Bug: 796151
Change-Id: Ica6f6ef47457eb34f82923ec6ae144f6b5b67fda
Reviewed-on: https://chromium-review.googlesource.com/852234
Commit-Queue: Christian Dullweber <dullweber@chromium.org>
Reviewed-by: Marijn Kruisselbrink <mek@chromium.org>
Reviewed-by: Jochen Eisinger <jochen@chromium.org>
Reviewed-by: Ken Rockot <rockot@chromium.org>
Cr-Commit-Position: refs/heads/master@{#533707}