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

ios/chrome/app/application_delegate/fake_startup_information.mm

Index: ios/chrome/app/application_delegate/fake_startup_information.mm
diff --git a/ios/chrome/app/application_delegate/fake_startup_information.mm b/ios/chrome/app/application_delegate/fake_startup_information.mm
index 2374800cf522c9b385265ba11119d364e583c173..ea7b0b9730b6b077abd0c3944912bed8d68b260c 100644
--- a/ios/chrome/app/application_delegate/fake_startup_information.mm
+++ b/ios/chrome/app/application_delegate/fake_startup_information.mm
@@ -4,12 +4,15 @@
 
 #include "ios/chrome/app/application_delegate/fake_startup_information.h"
 
-#import "base/mac/scoped_nsobject.h"
 #include "base/time/time.h"
 #include "ios/chrome/browser/app_startup_parameters.h"
 
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
 @interface FakeStartupInformation () {
-  base::scoped_nsobject<AppStartupParameters> _startupParameters;
+  AppStartupParameters* _startupParameters;

[sdefresne, 2017/02/21 09:42:40]

I think you can now @synthesize this property too and remove custom
setter/getter.

[stkhapugin, 2017/02/21 12:53:01]

Done.

 }
 
 @end
@@ -25,7 +28,7 @@
 }
 
 - (void)setStartupParameters:(AppStartupParameters*)startupParameters {

[sdefresne, 2017/02/21 09:42:40]

Remove if you use @synthesize.

[stkhapugin, 2017/02/21 12:53:01]

Done.

-  _startupParameters.reset([startupParameters retain]);
+  _startupParameters = startupParameters;
 }
 
 - (FirstUserActionRecorder*)firstUserActionRecorder {