Now that contextRoot is within the is check, don't need contextRoot at all

pkg/analyzer/lib/src/dart/analysis/driver.dart

 // Copyright (c) 2016, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 import 'dart:async';
 import 'dart:collection';
 import 'dart:typed_data';
 
 import 'package:analyzer/context/context_root.dart';
 import 'package:analyzer/context/declared_variables.dart';
@@ skipping 1292 matching lines @@
 }
 
 /**
  * A generic schedulable interface via the AnalysisDriverScheduler. Currently
  * only implemented by [AnalysisDriver] and the angular plugin, at least as
  * a temporary measure until the official plugin API is ready (and a different
  * scheduler is used)
  */
 abstract class AnalysisDriverGeneric {
   /**
-   * Information about the context root being analyzed by this driver.
-   */
-  ContextRoot get contextRoot;
-
-  /**
    * Return `true` if the driver has a file to analyze.
    */
   bool get hasFilesToAnalyze;
 
   /**
    * Return the priority of work that the driver needs to perform.
    */
   AnalysisDriverPriority get workPriority;
 
   /**
@@ skipping 730 matching lines @@
           libraryDeclarations.add(new TopLevelDeclarationInSource(
               file.source, declaration, isExported));
         }
       }
     }
 
     // We're not done yet.
     return false;
   }
 }