Use dartfmt on Observatory code

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

Index: runtime/observatory/lib/src/models/objects/source_location.dart
diff --git a/runtime/observatory/lib/src/models/objects/source_location.dart b/runtime/observatory/lib/src/models/objects/source_location.dart
index 5fc8b6cf8198a1050983c5495310324906e30120..1e1188baba97d1cf620eea3d887ce05a625f3f48 100644
--- a/runtime/observatory/lib/src/models/objects/source_location.dart
+++ b/runtime/observatory/lib/src/models/objects/source_location.dart
@@ -7,6 +7,7 @@ part of models;
 abstract class Location {
   /// The script containing the source location.
   ScriptRef get script;
+
   /// The last token of the location if this is a range. [optional]
   int get tokenPos;
 }
@@ -14,6 +15,7 @@ abstract class Location {
 abstract class SourceLocation implements Location {
   /// The last token of the location if this is a range.
   int get tokenPos;
+
   /// The last token of the location if this is a range. [optional]
   int get endTokenPos;
 }
@@ -22,9 +24,11 @@ abstract class UnresolvedSourceLocation implements Location {
   // [optional] The uri of the script containing the source location if the
   // script has yet to be loaded.
   String get scriptUri;
+
   /// [optional] An approximate line number for the source location. This may
   /// change when the location is resolved.
   int get line;
+
   /// [optional] An approximate column number for the source location. This may
   /// change when the location is resolved.
   int get column;