ContainsKey/Value have been removed.

Chromium change:

https://chromium.googlesource.com/chromium/src/+/73c901e63c6f2c1cfab306f4c4873bb30bfba651

commit 73c901e63c6f2c1cfab306f4c4873bb30bfba651
Author: Jan Wilken Dörrie <jdoerrie@chromium.org>
Date:   Wed Jun 12 09:02:32 2019 +0000

    [base] Remove base::Contains{Key,Value}

    This change removes base::ContainsKey() and base::ContainsValue() from
    the codebase. In addition, it migrates remaining usages of these methods
    to using base::Contains instead. These usages were not caught by the
    search and replace CLs, because they either were added afterwards, or
    were unqualified and used ADL.

    TBR=rockot@google.com,blundell@chromium.org

    Bug: 970209