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Instead of setting the sourcefile to PG when obfuscating Java, set it
to :chromium:{mapping file}:{channel}:{version code} so that

a) We can recognise chrome/webview stack frames by this string
b) The information required to uniquely identify the proguard mapping
   file in question is directly available in stack traces.

Bug: 1044585
Change-Id: Ib4fabccfb7693e5e97edc6f29be1cd6cb61fa1e6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2036091
Commit-Queue: Tobias Sargeant <tobiasjs@chromium.org>
Reviewed-by: Andrew Grieve <agrieve@chromium.org>
Reviewed-by: Piotr Bialecki <bialpio@chromium.org>
Reviewed-by: Richard Coles <torne@chromium.org>
Cr-Commit-Position: refs/heads/master@{#740625}