cros_generate_breakpad_symbols: Change GenerateBreakpadSymbol return.

Make GenerateBreakpadSymbol return the symbol file it's writing
out. This has no effect outside of unittests, but is needed for Ryu
symbol processing in another repository.

BUG=b/21954100
TEST=Unittests + manual testing with ryu scripts.

Change-Id: Ia30177613ff7fbb1b9ba573e564856a887b41f44
Reviewed-on: https://chromium-review.googlesource.com/303496
Commit-Ready: Don Garrett <dgarrett@chromium.org>
Tested-by: Don Garrett <dgarrett@chromium.org>
Reviewed-by: Matthew Sartori <msartori@chromium.org>
2 files changed