Fixed missing 'io.' prefixes on exit() calls

tools/testing/dart/test_runner.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 /**
  * Classes and methods for executing tests.
  *
  * This module includes:
  * - Managing parallel execution of tests, including timeout checks.
  * - Evaluating the output of each test as pass/fail/crash/timeout.
@@ skipping 1272 matching lines @@
       _stderrStream = new io.StringInputStream(_process.stderr);
       _process.onExit = makeExitHandler(">>> TEST CRASH");
       callback();
     }).catchError((e) {
       print("Process error:");
       print("  Command: $_executable ${_batchArguments.join(' ')}");
       print("  Error: $e");
       // If there is an error starting a batch process, chances are that
       // it will always fail. So rather than re-trying a 1000+ times, we
       // exit.
-      exit(1);
+      io.exit(1);
       return true;
     });
   }
 }
 
 /**
  * ProcessQueue is the master control class, responsible for running all
  * the tests in all the TestSuites that have been registered.  It includes
  * a rate-limited queue to run a limited number of tests in parallel,
  * a ProgressIndicator which prints output when tests are started and
@@ skipping 154 matching lines @@
           }
           if (!_isSeleniumAvailable) {
             _startSeleniumServer();
           }
         };
       }).catchError((e) {
         print("Error starting process:");
         print("  Command: $cmd ${arg.join(' ')}");
         print("  Error: $e");
         // TODO(ahe): How to report this as a test failure?
-        exit(1);
+        io.exit(1);
         return true;
       });
     }
   }
 
   void _runTest(TestCase test) {
     if (test.usesWebDriver) {
       browserUsed = test.configuration['browser'];
       if (_needsSelenium) _ensureSeleniumServerRunning();
     }
@@ skipping 50 matching lines @@
               new io.StringInputStream(_seleniumServer.stderr);
           stdoutStringStream.onLine =
               makeSeleniumServerHandler(stdoutStringStream);
           stderrStringStream.onLine =
               makeSeleniumServerHandler(stderrStringStream);
         }).catchError((e) {
           print("Process error:");
           print("  Command: java -jar $file");
           print("  Error: $e");
           // TODO(ahe): How to report this as a test failure?
-          exit(1);
+          io.exit(1);
           return true;
         });
       }
     };
   }
 
   Future _terminateBatchRunners() {
     var futures = new List();
     for (var runners in _batchProcesses.values) {
       for (var runner in runners) {
@@ skipping 196 matching lines @@
           completer.complete(testCase);
         }
       });
     }
     runCommand();
 
     return completer.future;
   }
 }