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Replace usages of java_files with sources in all //chrome/browser
BUILD.gn files, and automatically format.

TBR=yfriedman@chromium.org

Bug: 1035074
Change-Id: I50923d85e311ba9b072684beb2d0099910903005
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1973236
Commit-Queue: Natalie Chouinard <chouinard@chromium.org>
Reviewed-by: Gang Wu <gangwu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#727023}