Static warning fixes.

pkg/analysis_server/lib/src/context_manager.dart

Index: pkg/analysis_server/lib/src/context_manager.dart
diff --git a/pkg/analysis_server/lib/src/context_manager.dart b/pkg/analysis_server/lib/src/context_manager.dart
index a3fd86330797a4c620af5db5d437bd1e4e623fdb..d429e22a4c82d1d30c9dfbd99741d5ed5af02317 100644
--- a/pkg/analysis_server/lib/src/context_manager.dart
+++ b/pkg/analysis_server/lib/src/context_manager.dart
@@ -505,7 +505,7 @@ class ContextManagerImpl implements ContextManager {
     }
 
     // Analysis options are processed 'in-line'.
-    YamlNode analyzer = options[AnalyzerOptions.analyzer];
+    var analyzer = options[AnalyzerOptions.analyzer];
     if (analyzer is! YamlMap) {
       // No options for analyzer.
       return;