Fix HttpStreamFactoryImpl::RequestBidirectionalStreamJob build error.
Fix HttpStreamFactoryImpl::RequestBidirectionalStreamJob build error.

Cronet builds were broken by https://codereview.chromium.org/1540463003 that have changed constructor signature.

BUG=570098

Review URL: https://codereview.chromium.org/1570803002

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#368415}

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