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HELLO_IMPLEMENTATION was a typo in the no-win condition.

The correct is to check if HELLO_SHARED_IMPLEMENTATION was defined,
as that is what is defined by //tools/gn/example:hello_shared target.

BUG=None
TBR=brettw@chromium.org

Review URL: https://codereview.chromium.org/966333006

Cr-Commit-Position: refs/heads/master@{#318695}