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

Bug: 1113033
Change-Id: I52ff024fbe47121ebea142e769f771abbd925631
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2576434Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: Gavin Mak <gavinmak@google.com>
Cr-Commit-Position: refs/heads/master@{#834771}