[iOS] Enable the new Clear Browsing Data UI flag

This change is to enable the new-clear-browsing-data-ui flag.

The new Clear Browsing Data dialog adds the time range selection functionality
and shows browsing data volume details for each data type.
Launch Bug: https://bugs.chromium.org/p/chromium/issues/detail?id=627147
Screenshots: https://drive.google.com/open?id=1q1zJzB1abRsY1zCD4rLewvMxCnMr8WGf

Bug: 627147
Change-Id: I6d44d888697e5d03c71c4eacb07dcca6c84e2f88
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1556802
Reviewed-by: Rohit Rao <rohitrao@chromium.org>
Commit-Queue: Huanzhong Huang <huanzhong@chromium.org>
Cr-Commit-Position: refs/heads/master@{#661436}
1 file changed