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With this change, no caching headers are sent for icons, which is a
default of in-memory caching.

Bug: 868432
Test: None
Change-Id: I8dedb6a33035dd7e6cf32479921c0e6180e9ad03
Reviewed-on: https://chromium-review.googlesource.com/1154362Reviewed-by: Kristi Park <kristipark@chromium.org>
Commit-Queue: Mathieu Perreault <mathp@chromium.org>
Cr-Commit-Position: refs/heads/master@{#579088}