This adds "(synced)" to the password counter text if there is a stored password and password sync is activated.
I also removed all "browsing_data::" usages from browsing_data_utils.cc because this class is inside the browsing_data namespace.

BUG=681523

Review-Url: https://codereview.chromium.org/2798243004
Cr-Commit-Position: refs/heads/master@{#465566}