Run dartfmt on all files under runtime.

runtime/tests/vm/dart/optimized_stacktrace_line_test.dart

Index: runtime/tests/vm/dart/optimized_stacktrace_line_test.dart
diff --git a/runtime/tests/vm/dart/optimized_stacktrace_line_test.dart b/runtime/tests/vm/dart/optimized_stacktrace_line_test.dart
index cc7157d577ec957a941443ac16bcffa151c3f9c5..abdbefa252b45f78164baa968413b3ec8334fac9 100644
--- a/runtime/tests/vm/dart/optimized_stacktrace_line_test.dart
+++ b/runtime/tests/vm/dart/optimized_stacktrace_line_test.dart
@@ -8,7 +8,7 @@ import "package:expect/expect.dart";
 foo(x) => bar(x);
 
 bar(x) {
-  if (x == null) throw 42;  // throw at position 11:18
+  if (x == null) throw 42; // throw at position 11:18
   return x + 1;
 }
 
@@ -25,7 +25,7 @@ test1() {
   }
 
   // Optimized.
-  for (var i=0; i<10000; i++) foo(42);
+  for (var i = 0; i < 10000; i++) foo(42);
   try {
     foo(null);
     Expect.fail("Unreachable");
@@ -37,14 +37,13 @@ test1() {
   }
 }
 
-
 // (2) Test checked mode exceptions.
 maximus(x) => moritz(x);
 
 moritz(x) {
-  if (x == 333)  return 42 ? 0 : 1;  // Throws in checked mode.
-  if (x == 777)   {
-    bool b = x;  // Throws in checked mode.
+  if (x == 333) return 42 ? 0 : 1; // Throws in checked mode.
+  if (x == 777) {
+    bool b = x; // Throws in checked mode.
     return b;
   }
 
@@ -52,7 +51,7 @@ moritz(x) {
 }
 
 test2() {
-  for (var i=0; i<100000; i++) maximus(42);
+  for (var i = 0; i < 100000; i++) maximus(42);
   try {
     maximus(333);
   } catch (e, stacktrace) {