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Previously all dependencies would stop propagating for link purposes when a shared library or executable boundary is reached.

This patch makes public shared library dependencies propagate through shared libraries. Since the ability to use header files is propagated through these boundaries, so do the link dependencies. See the comment in target.cc for more details.

BUG=475091

Review URL: https://codereview.chromium.org/1083663007

Cr-Commit-Position: refs/heads/master@{#325471}