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The component browsing_data_ui contains code used by the Clear Browsing
Data dialog on all platforms. It was created because there was no other
component fitting that purpose.

However, the browsing_data component has been recently made into a layered
component (https://codereview.chromium.org/2127403002), providing various
browsing data related functionality for all platforms.

Since the two components have basically the same purpose and confusingly
similar names, we merge them into one.

TBR=dbeam@chromium.org
BUG=635873

Review-Url: https://codereview.chromium.org/2238453002
Cr-Commit-Position: refs/heads/master@{#419450}