[ObjC ARC] Converts ios/chrome/test/app:test_support to ARC.

ios/chrome/test/app/tab_test_util.mm

Index: ios/chrome/test/app/tab_test_util.mm
diff --git a/ios/chrome/test/app/tab_test_util.mm b/ios/chrome/test/app/tab_test_util.mm
index c75a4f28a469afc9c9b076ca2519bd5bdf0374c6..95dffda942d131c9f8710ede1f54e75d4557e2e9 100644
--- a/ios/chrome/test/app/tab_test_util.mm
+++ b/ios/chrome/test/app/tab_test_util.mm
@@ -7,7 +7,6 @@
 #import <Foundation/Foundation.h>
 
 #import "base/mac/foundation_util.h"
-#import "base/mac/scoped_nsobject.h"
 #import "ios/chrome/app/main_controller_private.h"
 #import "ios/chrome/browser/autofill/form_input_accessory_view_controller.h"
 #include "ios/chrome/browser/experimental_flags.h"
@@ -21,6 +20,11 @@
 #import "ios/chrome/browser/ui/tabs/tab_strip_controller_private.h"
 #import "ios/chrome/test/app/chrome_test_util.h"
 #import "ios/testing/wait_util.h"
+#import "ios/web/web_state/ui/crw_web_controller.h"
+
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
 
 namespace chrome_test_util {
 
@@ -46,16 +50,16 @@ BOOL IsIncognitoMode() {
 
 void OpenNewTab() {
   @autoreleasepool {  // Make sure that all internals are deallocated.
-    base::scoped_nsobject<GenericChromeCommand> command(
-        [[GenericChromeCommand alloc] initWithTag:IDC_NEW_TAB]);
+    GenericChromeCommand* command =
+        [[GenericChromeCommand alloc] initWithTag:IDC_NEW_TAB];
     chrome_test_util::RunCommandWithActiveViewController(command);
   }
 }
 
 void OpenNewIncognitoTab() {
   @autoreleasepool {  // Make sure that all internals are deallocated.
-    base::scoped_nsobject<GenericChromeCommand> command(
-        [[GenericChromeCommand alloc] initWithTag:IDC_NEW_INCOGNITO_TAB]);
+    GenericChromeCommand* command =
+        [[GenericChromeCommand alloc] initWithTag:IDC_NEW_INCOGNITO_TAB];
     chrome_test_util::RunCommandWithActiveViewController(command);
   }
 }