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Change the name of the icon list from `icons` to `sources`. This makes
gn format alphabetize the list.

Bug: 1132894
Change-Id: I8dfe07d74fa2ddfd32ef8bec8729923e999a640e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2427135
Commit-Queue: Evan Stade <estade@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#811364}