Start making server strong mode clean

pkg/analysis_server/test/domain_analysis_test.dart

 // Copyright (c) 2014, 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 test.domain.analysis;
 
 import 'dart:async';
 
 import 'package:analysis_server/plugin/protocol/protocol.dart';
 import 'package:analysis_server/src/analysis_server.dart';
@@ skipping 52 matching lines @@
         resourceProvider.newFile(fileB, '');
 
         server.setAnalysisRoots('0', ['/project/'], [], {});
 
         await server.onAnalysisComplete;
 
         var request =
             new AnalysisGetReachableSourcesParams(fileA).toRequest('0');
         var response = handler.handleRequest(request);
 
-        var json = response.toJson()[Response.RESULT];
+        Map json = response.toJson()[Response.RESULT];
 
         // Sanity checks.
         expect(json['sources'], hasLength(6));
         expect(json['sources']['file:///project/a.dart'],
             unorderedEquals(['dart:core', 'file:///project/b.dart']));
         expect(json['sources']['file:///project/b.dart'], ['dart:core']);
       });
 
       test('invalid source', () async {
         resourceProvider.newFile('/project/a.dart', 'import "b.dart";');
@@ skipping 724 matching lines @@
   test_beforeAnalysis() async {
     addTestFile('int V = 42;');
     createProject();
     // subscribe
     addAnalysisSubscription(AnalysisService.HIGHLIGHTS, testFile);
     // wait for analysis
     await waitForTasksFinished();
     expect(filesHighlights[testFile], isNotEmpty);
   }
 }