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Replace usages of java_files with sources in above gn files, and
automatically format.

This CL was uploaded by git cl split.

TBR=asanka@chromium.org

Bug: 1035074
Change-Id: Ic99cc6e64039396aa96c3144b8fe9667cac0084c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1980876Reviewed-by: Natalie Chouinard <chouinard@chromium.org>
Commit-Queue: Natalie Chouinard <chouinard@chromium.org>
Auto-Submit: Natalie Chouinard <chouinard@chromium.org>
Cr-Commit-Position: refs/heads/master@{#727227}