Run dartfmt on all files under runtime.

runtime/observatory/tests/service/pause_on_unhandled_async_exceptions_test.dart

Index: runtime/observatory/tests/service/pause_on_unhandled_async_exceptions_test.dart
diff --git a/runtime/observatory/tests/service/pause_on_unhandled_async_exceptions_test.dart b/runtime/observatory/tests/service/pause_on_unhandled_async_exceptions_test.dart
index 2f4354e4dccbf950d836fe9010635a185915d8c4..626a180df4ab2e407e1117f6023afdf72d8e15e5 100644
--- a/runtime/observatory/tests/service/pause_on_unhandled_async_exceptions_test.dart
+++ b/runtime/observatory/tests/service/pause_on_unhandled_async_exceptions_test.dart
@@ -11,9 +11,7 @@ import 'service_test_common.dart';
 
 const LINE_A = 37;
 
-class Foo {
-
-}
+class Foo {}
 
 doThrow() {
   throw "TheException"; // Line 13.
@@ -29,21 +27,17 @@ testeeMain() async {
     // caught.
     try {
       await asyncThrower();
-    } catch (e) {
-    }
+    } catch (e) {}
 
     // uncaught.
     try {
-      await asyncThrower();  // LINE_A.
-    } on double catch (e) {
-    }
-  } on Foo catch (e) {
-  }
+      await asyncThrower(); // LINE_A.
+    } on double catch (e) {}
+  } on Foo catch (e) {}
 }
 
 var tests = [
   hasStoppedWithUnhandledException,
-
   (Isolate isolate) async {
     print("We stoppped!");
     var stack = await isolate.getStack();
@@ -54,12 +48,10 @@ var tests = [
     expect(asyncStack[2].kind, equals(M.FrameKind.asyncSuspensionMarker));
     expect(asyncStack[3].toString(), contains('testeeMain'));
     // We've stopped at LINE_A.
-    expect(await asyncStack[3].location.toUserString(),
-           contains('.dart:$LINE_A'));
+    expect(
+        await asyncStack[3].location.toUserString(), contains('.dart:$LINE_A'));
   }
 ];
 
-main(args) => runIsolateTests(args,
-                              tests,
-                              pause_on_unhandled_exceptions: true,
-                              testeeConcurrent: testeeMain);
+main(args) => runIsolateTests(args, tests,
+    pause_on_unhandled_exceptions: true, testeeConcurrent: testeeMain);