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It was recently deprecated in favor of the less subtle
SessionID::NewUnique(), with the same implementation. This patch
removes the deprecated API which includes the aforementioned default
constructor as well as SessionID::set_id().

Most calling sites have been migrated in recent CLs and the remaining
ones are now surfaced, both intentional and accidental.

The plan for follow-up patches will consider:
1. Reintroducing the default constructor, but with
   SessionID::InvalidValue() as the default.
2. Moving SessionID::NewUnique() to a factory method in a newly
   introduced KeyedService for this purpose.

Bug: 823798
Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: I3abbc9b5a1497c11a99c9f80c6b2eadb7b7c6df8
Reviewed-on: https://chromium-review.googlesource.com/995899
Commit-Queue: Mikel Astiz <mastiz@chromium.org>
Reviewed-by: Yaron Friedman <yfriedman@chromium.org>
Reviewed-by: rajendrant <rajendrant@chromium.org>
Reviewed-by: Rohit Rao <rohitrao@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#550127}