Use dartfmt on Observatory code

runtime/observatory/lib/src/app/view_model.dart

Index: runtime/observatory/lib/src/app/view_model.dart
diff --git a/runtime/observatory/lib/src/app/view_model.dart b/runtime/observatory/lib/src/app/view_model.dart
index e7e546f36147ff01bc17d9c2a32be5fc292e3a72..d312cb3e917343897b830fc96015e640f4bb017f 100644
--- a/runtime/observatory/lib/src/app/view_model.dart
+++ b/runtime/observatory/lib/src/app/view_model.dart
@@ -10,11 +10,11 @@ class SortedTableColumn {
   static String toStringFormatter(dynamic v) {
     return v != null ? v.toString() : '<null>';
   }
+
   final String label;
   final ValueFormatter formatter;
   SortedTableColumn.withFormatter(this.label, this.formatter);
-  SortedTableColumn(this.label)
-      : formatter = toStringFormatter;
+  SortedTableColumn(this.label) : formatter = toStringFormatter;
 }
 
 class SortedTableRow {
@@ -35,6 +35,7 @@ class SortedTable {
     assert(index < columns.length);
     _sortColumnIndex = index;
   }
+
   int get sortColumnIndex => _sortColumnIndex;
   bool _sortDescending = true;
   bool get sortDescending => _sortDescending;
@@ -42,7 +43,6 @@ class SortedTable {
     _sortDescending = descending;
   }
 
-
   dynamic getSortKeyFor(int row, int col) {
     return rows[row].values[col];
   }