Restore MainViewControllerTest.StatusBar for iOS11

This test, disabled because it fails in iOS 11b3 and b4, works correctly
under beta 6. This CL can be landed when beta 6 is on the trybots.

Bug: 748738
Change-Id: I514eaa8dc104bff6f38b13bff2f541e18edbddbf
Reviewed-on: https://chromium-review.googlesource.com/647746Reviewed-by: Justin Cohen <justincohen@chromium.org>
Commit-Queue: Justin Cohen <justincohen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#501611}

ios/chrome/browser/ui/main/main_view_controller_unittest.mm

@@ -6,7 +6,6 @@
 
 #import <UIKit/UIKit.h>
 
-#include "base/ios/ios_util.h"
 #include "testing/gtest_mac.h"
 
 #if !defined(__has_feature) || !__has_feature(objc_arc)
@@ -114,9 +113,6 @@ TEST(MainViewControllerTest, SetActiveVC) {
 }
 
 TEST(MainViewControllerTest, StatusBar) {
-  // TODO(crbug.com/748738) This is broken with iOS11/Xcode 9 beta 4.
-  if (base::ios::IsRunningOnIOS11OrLater())
-    return;
   MainViewController* main_view_controller = [[MainViewController alloc] init];
   // MVC needs to be the root view controller for this to work, so save the
   // current one and restore it at the end of the test.