Change the interface of QuicDecrypter to accept an already allocated
buffer in order to remove an extra memory allocation.

Eliminates the 2% time spent in new from AeadBaseDecrypter, estimated at
least 3% total savings.

Merge internal changes: 85584634, 85637231

[email protected]

Review URL: https://codereview.chromium.org/908073003

Cr-Commit-Position: refs/heads/master@{#315793}
21 files changed