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Use a std::unique_ptr<ProofVerifyContext> instead of a raw pointer in the QuicCryptoClientStream constructor.

Merge internal change: 203836768

Change-Id: I80e3cefd998af739fd4baa0a6df79034da407613
Reviewed-on: https://chromium-review.googlesource.com/1147492Reviewed-by: Zhongyi Shi <zhongyi@chromium.org>
Commit-Queue: Ryan Hamilton <rch@chromium.org>
Cr-Commit-Position: refs/heads/master@{#577348}