[ObjC ARC] Converts ios/public/provider/chrome/browser/signin:signin to ARC.

ios/public/provider/chrome/browser/signin/chrome_identity_interaction_manager.mm

Index: ios/public/provider/chrome/browser/signin/chrome_identity_interaction_manager.mm
diff --git a/ios/public/provider/chrome/browser/signin/chrome_identity_interaction_manager.mm b/ios/public/provider/chrome/browser/signin/chrome_identity_interaction_manager.mm
index 6e5b223dd24e65a4fdb8970a510764888b01f090..efa66680d97aaf919741a300b49d536e4b07a7d1 100644
--- a/ios/public/provider/chrome/browser/signin/chrome_identity_interaction_manager.mm
+++ b/ios/public/provider/chrome/browser/signin/chrome_identity_interaction_manager.mm
@@ -4,11 +4,14 @@
 
 #import "ios/public/provider/chrome/browser/signin/chrome_identity_interaction_manager.h"
 
-#import "base/ios/weak_nsobject.h"
 #include "base/logging.h"
 
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
 @interface ChromeIdentityInteractionManager () {
-  base::WeakNSProtocol<id<ChromeIdentityInteractionManagerDelegate>> _delegate;
+  __weak id<ChromeIdentityInteractionManagerDelegate> _delegate;

[msarda, 2017/07/03 16:14:43]

Remove this and use a synthesized weak property.

[stkhapugin, 2017/07/11 13:14:42]

Done.

 }
 @end
 
@@ -19,7 +22,7 @@
 }
 
 - (void)setDelegate:(id<ChromeIdentityInteractionManagerDelegate>)delegate {

[msarda, 2017/07/03 16:14:42]

Remove this set now that the delegate is a regular weak property.

[stkhapugin, 2017/07/11 13:14:42]

Done.

-  _delegate.reset(delegate);
+  _delegate = delegate;
 }
 
 - (BOOL)isCanceling {