Don't send 'Response.refactoringRequestCancelle' if the request is null.
Don't send 'Response.refactoringRequestCancelle' if the request is null.

Not sure how to reproduce this, but saw this in the exceptions log.
Just once, so must be a pretty event, but still.

R=brianwilkerson@google.com
BUG=

Review-Url: https://codereview.chromium.org/2665403002 .

dart-archive/dart-sdk,dart-archive/dart-sdk,dartino/dart-sdk,dartino/dart-sdk,dartino/dart-sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dartino/dart-sdk,dartino/dart-sdk,dartino/dart-sdk,dart-archive/dart-sdk,dart-archive/dart-sdk,dart-lang/sdk,dart-archive/dart-sdk,dartino/dart-sdk,dart-lang/sdk,dartino/dart-sdk,dart-archive/dart-sdk,dart-archive/dart-sdk,dart-archive/dart-sdk,dartino/dart-sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-archive/dart-sdk