move context id constant to AnalysisServer

pkg/analysis_server/lib/src/domain_server.dart

Index: pkg/analysis_server/lib/src/domain_server.dart
diff --git a/pkg/analysis_server/lib/src/domain_server.dart b/pkg/analysis_server/lib/src/domain_server.dart
index 102a79c2f77e2ade4812d8ba1d411ec4479273c0..495024a9dc715679db8da8de19fbf23cc461a316 100644
--- a/pkg/analysis_server/lib/src/domain_server.dart
+++ b/pkg/analysis_server/lib/src/domain_server.dart
@@ -38,11 +38,6 @@ class ServerDomainHandler implements RequestHandler {
   static const String VERSION_METHOD = 'server.version';
 
   /**
-   * The name of the contextId parameter.
-   */
-  static const String CONTEXT_ID_PARAM = 'contextId';
-
-  /**
    * The name of the packageMap parameter.
    */
   static const String PACKAGE_MAP_PARAM = 'packageMap';
@@ -95,7 +90,7 @@ class ServerDomainHandler implements RequestHandler {
     String sdkDirectory = request.getRequiredParameter(SDK_DIRECTORY_PARAM).asString();
     Map<String, String> packageMap = request.getParameter(PACKAGE_MAP_PARAM, {}).asStringMap();
 
-    String contextId = request.getRequiredParameter(CONTEXT_ID_PARAM).asString();
+    String contextId = request.getRequiredParameter(AnalysisServer.CONTEXT_ID_PARAM).asString();
     if (server.contextMap.containsKey(contextId)) {
       return new Response.contextAlreadyExists(request);
     }
@@ -126,7 +121,7 @@ class ServerDomainHandler implements RequestHandler {
    * will result in an error being returned.
    */
   Response deleteContext(Request request) {
-    String contextId = request.getRequiredParameter(CONTEXT_ID_PARAM).asString();
+    String contextId = request.getRequiredParameter(AnalysisServer.CONTEXT_ID_PARAM).asString();
 
     AnalysisContext removedContext = server.contextMap.remove(contextId);
     if (removedContext == null) {