Update plugin spec to match server spec changes

pkg/analyzer_plugin/test/integration/support/protocol_matchers.dart

 // Copyright (c) 2017, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 //
 // This file has been automatically generated.  Please do not edit it manually.
 // To regenerate the file, use the script
 // "pkg/analysis_server/tool/spec/generate_files".
 
 /**
  * Matchers for data types defined in the analysis server API
@@ skipping 561 matching lines @@
  *   "kind": CompletionSuggestionKind
  *   "relevance": int
  *   "completion": String
  *   "selectionOffset": int
  *   "selectionLength": int
  *   "isDeprecated": bool
  *   "isPotential": bool
  *   "docSummary": optional String
  *   "docComplete": optional String
  *   "declaringType": optional String
+ *   "defaultArgumentListString": optional String
+ *   "defaultArgumentListTextRanges": optional List<int>
  *   "element": optional Element
  *   "returnType": optional String
  *   "parameterNames": optional List<String>
  *   "parameterTypes": optional List<String>
  *   "requiredParameterCount": optional int
  *   "hasNamedParameters": optional bool
  *   "parameterName": optional String
  *   "parameterType": optional String
  *   "importUri": optional String
  * }
  */
 final Matcher isCompletionSuggestion = new LazyMatcher(() => new MatchesJsonObject(
   "CompletionSuggestion", {
     "kind": isCompletionSuggestionKind,
     "relevance": isInt,
     "completion": isString,
     "selectionOffset": isInt,
     "selectionLength": isInt,
     "isDeprecated": isBool,
     "isPotential": isBool
   }, optionalFields: {
     "docSummary": isString,
     "docComplete": isString,
     "declaringType": isString,
+    "defaultArgumentListString": isString,
+    "defaultArgumentListTextRanges": isListOf(isInt),
     "element": isElement,
     "returnType": isString,
     "parameterNames": isListOf(isString),
     "parameterTypes": isListOf(isString),
     "requiredParameterCount": isInt,
     "hasNamedParameters": isBool,
     "parameterName": isString,
     "parameterType": isString,
     "importUri": isString
   }));
@@ skipping 949 matching lines @@
  *
  * {
  *   "newName": String
  * }
  */
 final Matcher isRenameOptions = new LazyMatcher(() => new MatchesJsonObject(
   "rename options", {
     "newName": isString
   }));