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This CL fix the UI looks of CCA under RTL language in following aspect:
1. Use flex-start on setting menu.
2. Mirror the directional icon.
3. Substitute padding/margin-left/right with start/end.
4. Have extra rtl rule flipping css left/right attribute.

Bug: 1133093
Test: Manually on LTR/RTL languages.

Change-Id: I684ac98903be3338e15aea28005e92aa57d4b5de
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2437318Reviewed-by: Shik Chen <shik@chromium.org>
Commit-Queue: Inker Kuo <inker@chromium.org>
Cr-Commit-Position: refs/heads/master@{#813650}