Remove test retrying for Safari, in test scripts.

BUG=dartbug.com/21434
[email protected]

Review URL: https://codereview.chromium.org//884073003

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@43503 260f80e4-7a28-3924-810f-c04153c831b5

Author: whesse

tools/testing/dart/test_runner.dart

@@ -2622,15 +2622,6 @@ class ReplayingCommandExecutor implements CommandExecutor {
 
 bool shouldRetryCommand(CommandOutput output) {
   var command = output.command;
-  // We rerun tests on Safari because 6.2 and 7.1 are flaky. Issue 21434.
-  if (command is BrowserTestCommand &&
-      command.retry &&
-      command.browser == 'safari' &&
-      output is BrowserControllerTestOutcome &&
-      output._rawOutcome != Expectation.PASS) {
-    return true;
-  }
-
   if (!output.successful) {
     List<String> stdout, stderr;