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All BUILD.gn files have been migrated from using java_files to sources,
so replace use of java_files with sources in Android build rules.

Bug: 1035082
Change-Id: I73fa5ecc53ca0b0acd3146562c2eb10ded533ade
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1988516Reviewed-by: Eric Stevenson <estevenson@chromium.org>
Commit-Queue: Natalie Chouinard <chouinard@chromium.org>
Cr-Commit-Position: refs/heads/master@{#728780}