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Generate DIR_METADATA files and remove metadata from OWNERS
files for directories under //ui.

Bug: 1113033
Change-Id: I6c6e60157e9dc9b44cbccd8c3d173db21be0b94d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2583183Reviewed-by: Sadrul Chowdhury <sadrul@chromium.org>
Commit-Queue: Gavin Mak <gavinmak@google.com>
Cr-Commit-Position: refs/heads/master@{#836264}