Run dartfmt on all files under runtime.

runtime/lib/core_patch.dart

Index: runtime/lib/core_patch.dart
diff --git a/runtime/lib/core_patch.dart b/runtime/lib/core_patch.dart
index deed7c9cc48af3929a0c805184500298e7149229..6000ffc06d7fe41ba6132794fbf02a0926583df6 100644
--- a/runtime/lib/core_patch.dart
+++ b/runtime/lib/core_patch.dart
@@ -36,14 +36,13 @@ class _SyncIterable extends IterableBase {
 }
 
 class _SyncIterator implements Iterator {
-  bool isYieldEach;  // Set by generated code for the yield* statement.
+  bool isYieldEach; // Set by generated code for the yield* statement.
   Iterator yieldEachIterator;
-  var _current;  // Set by generated code for the yield and yield* statement.
+  var _current; // Set by generated code for the yield and yield* statement.
   _SyncGeneratorCallback _moveNextFn;
 
-  get current => yieldEachIterator != null
-      ? yieldEachIterator.current
-      : _current;
+  get current =>
+      yieldEachIterator != null ? yieldEachIterator.current : _current;
 
   _SyncIterator(this._moveNextFn);
 
@@ -51,7 +50,7 @@ class _SyncIterator implements Iterator {
     if (_moveNextFn == null) {
       return false;
     }
-    while(true) {
+    while (true) {
       if (yieldEachIterator != null) {
         if (yieldEachIterator.moveNext()) {
           return true;
@@ -77,6 +76,8 @@ class _SyncIterator implements Iterator {
   }
 }
 
-@patch class StackTrace {
-  @patch static StackTrace get current native "StackTrace_current";
+@patch
+class StackTrace {
+  @patch
+  static StackTrace get current native "StackTrace_current";
 }