Remove an unused request and the associated type

pkg/analyzer_plugin/lib/protocol/protocol_constants.dart

Index: pkg/analyzer_plugin/lib/protocol/protocol_constants.dart
diff --git a/pkg/analyzer_plugin/lib/protocol/protocol_constants.dart b/pkg/analyzer_plugin/lib/protocol/protocol_constants.dart
index fcd91764f8813b25a1ea03a45a6ea58051597923..aaca8792ae4c97e1b3291a0b01a3df5496da454a 100644
--- a/pkg/analyzer_plugin/lib/protocol/protocol_constants.dart
+++ b/pkg/analyzer_plugin/lib/protocol/protocol_constants.dart
@@ -35,9 +35,6 @@ const String ANALYSIS_REQUEST_HANDLE_WATCH_EVENTS =
 const String ANALYSIS_REQUEST_HANDLE_WATCH_EVENTS_EVENTS = 'events';
 const String ANALYSIS_REQUEST_REANALYZE = 'analysis.reanalyze';
 const String ANALYSIS_REQUEST_REANALYZE_ROOTS = 'roots';
-const String ANALYSIS_REQUEST_SET_CONTEXT_BUILDER_OPTIONS =
-    'analysis.setContextBuilderOptions';
-const String ANALYSIS_REQUEST_SET_CONTEXT_BUILDER_OPTIONS_OPTIONS = 'options';
 const String ANALYSIS_REQUEST_SET_CONTEXT_ROOTS = 'analysis.setContextRoots';
 const String ANALYSIS_REQUEST_SET_CONTEXT_ROOTS_ROOTS = 'roots';
 const String ANALYSIS_REQUEST_SET_PRIORITY_FILES = 'analysis.setPriorityFiles';