+ Update grey 50, 100, 200, 300, 400, 600 to the new color
+ Update blue button corner radius to 4dp
+ Make affecting xml files to use pre-defined text styles

Bug: 849126
Change-Id: I44276c6539d2ac1f30a3bd8dcde1dcfc26b103f7
Reviewed-on: https://chromium-review.googlesource.com/1188456
Commit-Queue: Becky Zhou <huayinz@chromium.org>
Reviewed-by: Theresa <twellington@chromium.org>
Cr-Commit-Position: refs/heads/master@{#587328}