Run dartfmt on all files under runtime.

runtime/lib/symbol_patch.dart

Index: runtime/lib/symbol_patch.dart
diff --git a/runtime/lib/symbol_patch.dart b/runtime/lib/symbol_patch.dart
index aabf923d2f7f2e85ae7022bf3122113db95553fe..3e4c07c53b8dc773b9eae84cfbe4d5b3f197d829 100644
--- a/runtime/lib/symbol_patch.dart
+++ b/runtime/lib/symbol_patch.dart
@@ -4,11 +4,13 @@
 
 import 'dart:core' hide Symbol;
 
-@patch class Symbol {
-  @patch const Symbol(String name)
-      : this._name = name;
+@patch
+class Symbol {
+  @patch
+  const Symbol(String name) : this._name = name;
 
-  @patch toString() => 'Symbol("${getUnmangledName(this)}")';
+  @patch
+  toString() => 'Symbol("${getUnmangledName(this)}")';
 
   static getUnmangledName(Symbol symbol) {
     String string = Symbol.getName(symbol);
@@ -54,7 +56,8 @@ import 'dart:core' hide Symbol;
     return result.toString();
   }
 
-  @patch int get hashCode {
+  @patch
+  int get hashCode {
     const arbitraryPrime = 664597;
     return 0x1fffffff & (arbitraryPrime * _name.hashCode);
   }