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Mojofying service worker storage operations introduced some test
flakiness. A summary of the cause is:
- These tests uses browser contexts and browser contexts initialize
  storage partition.
- Storage partition initialization schedules some tasks which call
  service worker storage operations but don't wait for results.
- Mojo generated bindings for storage operations have DCHECKs to
  make sure callbacks of these calls are executed before destroying
  mojo connections.
- These DCHECKs fail because tasks don't wait for results.

This CL runs pending tasks in ProxyRunTestOnMainThreadLoop() as
suggested in [1].

[1] https://chromium-review.googlesource.com/c/chromium/src/+/2561963/comment/e878eb61_e0080fca/

Bug: 1153911, 1133143
Change-Id: Ie930f5ce0aa809e45877127988b99ec603cdcfd5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2567010Reviewed-by: Gabriel Charette <gab@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: Kenichi Ishibashi <bashi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#833111}