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kEnhancedBookmarksExperiment is used by android intrumentation tests to
force enhanced bookmark feature to be enabled.
https://codereview.chromium.org/1009673002 introduced a regression that
the even if the flag is set to be true, it does not take effect. This CL
fixes it.

BUG=468106

Review URL: https://codereview.chromium.org/1017913002

Cr-Commit-Position: refs/heads/master@{#321429}