More strong mode clean-up

pkg/analysis_server/test/services/search/search_engine_test.dart

Index: pkg/analysis_server/test/services/search/search_engine_test.dart
diff --git a/pkg/analysis_server/test/services/search/search_engine_test.dart b/pkg/analysis_server/test/services/search/search_engine_test.dart
index ffdfd4c58f3957c80d47f954cd72a2ef1ec3bc4e..b67ce1a4f4ca7414bf65be0680a99dbaeffc7085 100644
--- a/pkg/analysis_server/test/services/search/search_engine_test.dart
+++ b/pkg/analysis_server/test/services/search/search_engine_test.dart
@@ -36,8 +36,9 @@ class ExpectedMatch {
     this.range = new SourceRange(offset, length);
   }
 
-  bool operator ==(SearchMatch match) {
-    return match.element == this.element &&
+  bool operator ==(Object match) {
+    return match is SearchMatch &&
+        match.element == this.element &&
         match.kind == this.kind &&
         match.isResolved == this.isResolved &&
         match.isQualified == this.isQualified &&