[base] Replace Contains{Key,Value} with Contains in //ui

This change replaces usages of base::ContainsKey() and base::ContainsValue()
with base::Contains() in //ui.

Reproduction:
 - sed -i 's/\bbase::ContainsKey\b/base::Contains/g'
 - sed -i 's/\bbase::ContainsValue\b/base::Contains/g'
 - git cl format

This CL was uploaded by git cl split.

R=sadrul@chromium.org

Bug: 970209
Change-Id: Ia41e90dc60687f1adb07f0552141e31a4dee83c2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1648189
Auto-Submit: Jan Wilken Dörrie <jdoerrie@chromium.org>
Reviewed-by: Sadrul Chowdhury <sadrul@chromium.org>
Commit-Queue: Jan Wilken Dörrie <jdoerrie@chromium.org>
Cr-Commit-Position: refs/heads/master@{#667200}