Use dartfmt on Observatory code

runtime/observatory/lib/src/models/objects/error.dart

Index: runtime/observatory/lib/src/models/objects/error.dart
diff --git a/runtime/observatory/lib/src/models/objects/error.dart b/runtime/observatory/lib/src/models/objects/error.dart
index 06c6e612e6cec0e92bc3ab49ce6ca431c9f7a35a..d59ab6c001085966bdb9a5bc3f0eb3ddc9c29927 100644
--- a/runtime/observatory/lib/src/models/objects/error.dart
+++ b/runtime/observatory/lib/src/models/objects/error.dart
@@ -7,11 +7,14 @@ part of models;
 enum ErrorKind {
   /// The isolate has encountered an unhandled Dart exception.
   unhandledException,
+
   /// The isolate has encountered a Dart language error in the program.
   languageError,
+
   /// The isolate has encounted an internal error. These errors should be
   /// reported as bugs.
   internalError,
+
   /// The isolate has been terminated by an external source.
   terminationError
 }
@@ -21,6 +24,4 @@ abstract class ErrorRef extends ObjectRef {
   String get message;
 }
 
-abstract class Error extends Object implements ErrorRef {
-
-}
+abstract class Error extends Object implements ErrorRef {}