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We currently don't have extensive tests on java side which checks
any leakage of data across activities.

This CL adds browser tests to check cookies leaks involving both
Tabbed and CCT activities for both regular and incognito mode.

Bug: 1035770
Change-Id: Iba3481d51923c0a30ec38646b25614db36549bdb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2054109
Commit-Queue: Rohit Agarwal <roagarwal@chromium.org>
Reviewed-by: Ramin Halavati <rhalavati@chromium.org>
Reviewed-by: Peter Conn <peconn@chromium.org>
Cr-Commit-Position: refs/heads/master@{#748143}