GitLab

instread of QuicClientSession's constructor to make it easier for server
side code to do the same.

Call QuicClientSessionBase::InitializeSession() after constructing
QuicCryptoClientStream.

This is done per discussion in interal change: 72671781

The following are the earlier related issues:
  https://codereview.chromium.org/393953009/
  https://codereview.chromium.org/407193002/

R=rch@chromium.org

Review URL: https://codereview.chromium.org/481103003

Cr-Commit-Position: refs/heads/master@{#291812}