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

Also include "sources" in the lists of forwarded variables alongside
"java_files" where necessary.

Bug: 1035074
Change-Id: I5b570a3a0115993b2ba517362b47a31f64edcc1e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1973243Reviewed-by: Eric Stevenson <estevenson@chromium.org>
Commit-Queue: Natalie Chouinard <chouinard@chromium.org>
Cr-Commit-Position: refs/heads/master@{#726568}