Remove an unused request and the associated type

pkg/analyzer_plugin/test/plugin/plugin_test.dart

Index: pkg/analyzer_plugin/test/plugin/plugin_test.dart
diff --git a/pkg/analyzer_plugin/test/plugin/plugin_test.dart b/pkg/analyzer_plugin/test/plugin/plugin_test.dart
index c26eb82d900f5e6dbbc543daa3dacffc308d7624..740453f3dae1daf78030fca4b592dbcf0f4f815f 100644
--- a/pkg/analyzer_plugin/test/plugin/plugin_test.dart
+++ b/pkg/analyzer_plugin/test/plugin/plugin_test.dart
@@ -100,14 +100,6 @@ class ServerPluginTest {
     expect(result, isNotNull);
   }
 
-  @failingTest
-  test_handleAnalysisSetContextBuilderOptions() async {
-    var result = await plugin.handleAnalysisSetContextBuilderOptions(
-        new AnalysisSetContextBuilderOptionsParams(
-            new ContextBuilderOptions()));
-    expect(result, isNotNull);
-  }
-
   test_handleAnalysisSetContextRoots() async {
     var result = await plugin.handleAnalysisSetContextRoots(
         new AnalysisSetContextRootsParams([contextRoot1]));
@@ -295,13 +287,6 @@ class ServerPluginTest {
     expect(result, isNotNull);
   }
 
-  test_onRequest_analysisSetContextBuilderOptions() async {
-    var result = await channel.sendRequest(
-        new AnalysisSetContextBuilderOptionsParams(
-            new ContextBuilderOptions()));
-    expect(result, isNotNull);
-  }
-
   test_onRequest_analysisSetContextRoots() async {
     var result = await channel
         .sendRequest(new AnalysisSetContextRootsParams([contextRoot1]));