Start making server strong mode clean

pkg/analysis_server/test/domain_diagnostic_test.dart

Index: pkg/analysis_server/test/domain_diagnostic_test.dart
diff --git a/pkg/analysis_server/test/domain_diagnostic_test.dart b/pkg/analysis_server/test/domain_diagnostic_test.dart
index d6de07f7376fbf9f01fe7899d097030b5eb9e6f7..d2288ae32f2af535c230096a0cff71d0c23b0916 100644
--- a/pkg/analysis_server/test/domain_diagnostic_test.dart
+++ b/pkg/analysis_server/test/domain_diagnostic_test.dart
@@ -73,7 +73,7 @@ main() {
 
       int fileCount = 1 /* test.dart */;
 
-      var json = response.toJson()[Response.RESULT];
+      Map json = response.toJson()[Response.RESULT];
       expect(json['contexts'], hasLength(1));
       var context = json['contexts'][0];
       expect(context['name'], '/project');
@@ -86,7 +86,7 @@ main() {
     test('getDiagnostics - (no root)', () async {
       var request = new DiagnosticGetDiagnosticsParams().toRequest('0');
       var response = handler.handleRequest(request);
-      var json = response.toJson()[Response.RESULT];
+      Map json = response.toJson()[Response.RESULT];
       expect(json['contexts'], hasLength(0));
     });
   });