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Only depend on the aliased protobuf runtime rather than the real target.
This also updates a deprecated method usage (valueOf) since it is no
longer available in the latest runtime.

TBR=mechanical changes

Bug: 1114836
Change-Id: I8896cd81e17c4fbd9dc368b5906618fe743d124e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2357634
Commit-Queue: Mohamed Heikal <mheikal@chromium.org>
Reviewed-by: Sam Maier <smaier@chromium.org>
Cr-Commit-Position: refs/heads/master@{#798751}