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Currently if the default favicon request is caught by the testing service worker
the test fails.
This is causing the test flakiness.
To fix this flakiness, this CL change the fetch event handler of the service
worker to ignore the default favicon request.

Bug: 912543
Change-Id: Icdddd902a4547361320f43db5b9090270ba74509
Reviewed-on: https://chromium-review.googlesource.com/c/1370160
Commit-Queue: Tsuyoshi Horo <horo@chromium.org>
Reviewed-by: Matt Falkenhagen <falken@chromium.org>
Cr-Commit-Position: refs/heads/master@{#615470}