Make MockAnalysisDriver implement AnalysisDriver, not extend.

The way we used to configure it does not work with changed I want to
make, specifically we were given SourceFactory with no resolves,
so no DartUriResolver, so no SDK.

R=brianwilkerson@google.com

Change-Id: Ibf798aae1792366cfbe240f9781038568936146d
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/149384
Reviewed-by: Brian Wilkerson <brianwilkerson@google.com>
Commit-Queue: Konstantin Shcheglov <scheglov@google.com>

https://dart.googlesource.com/sdk/+/a45d66c6e9262e42391611ddfd5da0cc9be8a7c5
1 file changed
tree: 50a1b937ba6bc0718b48e5d42a3048b507206cad
  1. commits.json