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Initialize the QuicDispatcher with a PacketWriter instead of an int fd.
QuicDispatcher::Initialize() used to take an fd which chromium does not make
use of. Instead, it should simply take a PacketWriter* which the caller
should be responsible for creating. Renamed Initialize() to
InitializeWithWriter() to reflect this. Removed the CreateWriter() method
from the QuicDispatcher and moved it to QuicServer.
Merge internal change: 89495510

Review URL: https://codereview.chromium.org/1031243002

Cr-Commit-Position: refs/heads/master@{#322450}