Rename Error to RequestError in analysis server API.

pkg/analysis_server/test/integration/protocol_matchers.dart

Index: pkg/analysis_server/test/integration/protocol_matchers.dart
diff --git a/pkg/analysis_server/test/integration/protocol_matchers.dart b/pkg/analysis_server/test/integration/protocol_matchers.dart
index e0cea8cd068186d4496d6128487043bfe79d4a8c..e69335284b35e86a52619935d7d357743e25356a 100644
--- a/pkg/analysis_server/test/integration/protocol_matchers.dart
+++ b/pkg/analysis_server/test/integration/protocol_matchers.dart
@@ -1078,23 +1078,6 @@ final Matcher isElementKind = new MatchesEnum("ElementKind", [
 ]);
 
 /**
- * Error
- *
- * {
- *   "code": RequestErrorCode
- *   "message": String
- *   "data": optional object
- * }
- */
-final Matcher isError = new LazyMatcher(() => new MatchesJsonObject(
-  "Error", {
-    "code": isRequestErrorCode,
-    "message": isString
-  }, optionalFields: {
-    "data": isObject
-  }));
-
-/**
  * ErrorFixes
  *
  * {
@@ -1612,6 +1595,23 @@ final Matcher isRemoveContentOverlay = new LazyMatcher(() => new MatchesJsonObje
   }));
 
 /**
+ * RequestError
+ *
+ * {
+ *   "code": RequestErrorCode
+ *   "message": String
+ *   "data": optional object
+ * }
+ */
+final Matcher isRequestError = new LazyMatcher(() => new MatchesJsonObject(
+  "RequestError", {
+    "code": isRequestErrorCode,
+    "message": isString
+  }, optionalFields: {
+    "data": isObject
+  }));
+
+/**
  * RequestErrorCode
  *
  * enum {