Move exception support to its own library

pkg/analysis_server/lib/src/domains/analysis/navigation.dart

 // Copyright (c) 2015, 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.
 
 library domains.analysis.navigation;
 
 import 'dart:collection';
 
 import 'package:analysis_server/plugin/analysis/navigation/navigation_core.dart';
 import 'package:analysis_server/src/analysis_server.dart';
 import 'package:analysis_server/src/collections.dart';
 import 'package:analysis_server/src/protocol_server.dart' as protocol;
+import 'package:analyzer/exception/exception.dart';
 import 'package:analyzer/src/generated/engine.dart'
     show AnalysisContext, AnalysisEngine;
-import 'package:analyzer/src/generated/java_engine.dart' show CaughtException;
 import 'package:analyzer/src/generated/source.dart' show Source, SourceRange;
 
 /**
  * Compute all known navigation information for the given part of [source].
  */
 NavigationCollectorImpl computeNavigation(AnalysisServer server,
     AnalysisContext context, Source source, int offset, int length) {
   NavigationCollectorImpl collector = new NavigationCollectorImpl();
   List<NavigationContributor> contributors =
       server.serverPlugin.navigationContributors;
@@ skipping 84 matching lines @@
           location.offset,
           location.length,
           location.startLine,
           location.startColumn);
       targets.add(target);
       targetMap[pair] = index;
     }
     return index;
   }
 }