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In QuicCryptoClientConfig, change the preferred encryption algorithm from chacha20 to aes-gcm. Client side code, not flag protected in GFE.

Merge internal change: 219390992

Change-Id: I812be51b1ebacfd3c8a2fcbdac054da098306c3f
Reviewed-on: https://chromium-review.googlesource.com/c/1312093Reviewed-by: Ryan Hamilton <rch@chromium.org>
Commit-Queue: Ryan Hamilton <rch@chromium.org>
Cr-Commit-Position: refs/heads/master@{#604579}