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Requested by UX, this CL includes
* Change "Dismiss" to "Got it"
* Change buttons order depending on OS.
* Change button padding

Bug: 1121399
Change-Id: I2a019f15e5bdd6c188583922511595aa4aca6c83
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2414836
Commit-Queue: Keren Zhu <kerenzhu@chromium.org>
Reviewed-by: Collin Baker <collinbaker@chromium.org>
Cr-Commit-Position: refs/heads/master@{#807993}