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Currently LauncherSearchProvider use png as the format for the result.
This CL changes the format to vector icons (.icon).

Bug: 1067326
Change-Id: I55fb11ed50906a5199bc28339de42d4903433b36
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2352290Reviewed-by: Austin Tankiang <austinct@chromium.org>
Reviewed-by: Noel Gordon <noel@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Reviewed-by: Jia Meng <jiameng@chromium.org>
Reviewed-by: Tony Yeoman <tby@chromium.org>
Commit-Queue: Thanh Nguyen <thanhdng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#798087}