Make Change implementation consistent with the server spec.

pkg/analysis_server/lib/src/edit/fix.dart

Index: pkg/analysis_server/lib/src/edit/fix.dart
diff --git a/pkg/analysis_server/lib/src/edit/fix.dart b/pkg/analysis_server/lib/src/edit/fix.dart
index 5e765d4d2f067157633eafe440596cb4a226248c..f34c110521727ff90f47f0250357df8fff23f952 100644
--- a/pkg/analysis_server/lib/src/edit/fix.dart
+++ b/pkg/analysis_server/lib/src/edit/fix.dart
@@ -32,13 +32,4 @@ class ErrorFixes implements HasToJson {
 
   @override
   String toString() => 'ErrorFixes(error=$error, fixes=$fixes)';
-
-  static ErrorFixes fromJson(Map<String, Object> json) {
-    AnalysisError error = AnalysisError.fromJson(json[ERROR]);
-    ErrorFixes errorFixes = new ErrorFixes(error);
-    errorFixes.fixes.addAll((json[FIXES] as List).map((json) {
-      return Change.fromJson(json);
-    }));
-    return errorFixes;
-  }
 }