Use generated classes to create requests in analysis server unit tests.

pkg/analysis_server/lib/src/protocol.dart

Index: pkg/analysis_server/lib/src/protocol.dart
diff --git a/pkg/analysis_server/lib/src/protocol.dart b/pkg/analysis_server/lib/src/protocol.dart
index 9cfc5be1054a57592e49e18aab61bfc236dde191..f0cd4d8c47fcb609bf4e18857f8a21ea1cc4bd9f 100644
--- a/pkg/analysis_server/lib/src/protocol.dart
+++ b/pkg/analysis_server/lib/src/protocol.dart
@@ -107,13 +107,6 @@ class Request {
   }
 
   /**
-   * Set the value of the parameter with the given [name] to the given [value].
-   */
-  void setParameter(String name, Object value) {
-    params[name] = value;
-  }
-
-  /**
    * Return a table representing the structure of the Json object that will be
    * sent to the client to represent this response.
    */