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This aligns the look more with the future Harmony UI. Additionally,
this CL addds a .icon version of the "help-outline" svg image in
chrome/browser/resources/settings/icons.html

Bug: 736318
Change-Id: I41090a0ee5ed7e23490855213baf6b9d89b78629
Reviewed-on: https://chromium-review.googlesource.com/544199
Commit-Queue: Charlie Harrison <csharrison@chromium.org>
Reviewed-by: Robert Sesek <rsesek@chromium.org>
Reviewed-by: Peter Kasting <pkasting@chromium.org>
Reviewed-by: Evan Stade <estade@chromium.org>
Reviewed-by: Bret Sepulveda <bsep@chromium.org>
Cr-Commit-Position: refs/heads/master@{#491191}