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

ios/public/provider/chrome/browser/signin/chrome_identity.h

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef IOS_PUBLIC_PROVIDER_CHROME_BROWSER_SIGNIN_CHROME_IDENTITY_H_
 #define IOS_PUBLIC_PROVIDER_CHROME_BROWSER_SIGNIN_CHROME_IDENTITY_H_
 
 #import <Foundation/Foundation.h>
 
 // A single identity used for signing in.
 // Identity is the equivalent of an account. A user may have multiple identities
 // or accounts associated with a single device.
 @interface ChromeIdentity : NSObject
 
 // Identity/account email address. This can be shown to the user, but is not a
 // unique identifier (@see gaiaID).
-@property(nonatomic, readonly) NSString* userEmail;
+@property(strong, nonatomic, readonly) NSString* userEmail;
 
 // The unique GAIA user identifier for this identity/account.
 // You may use this as a unique identifier to remember a particular identity.
-@property(nonatomic, readonly) NSString* gaiaID;
+@property(weak, nonatomic, readonly) NSString* gaiaID;

[msarda, 2017/07/11 13:54:41]

Same comment as for userEmail. Let's make them all strong.

[stkhapugin, 2017/07/12 14:54:05]

Done.

 
 // Returns the full name of the identity.
 // Could be nil if no full name has been fetched for this account yet.
-@property(nonatomic, readonly) NSString* userFullName;
+@property(weak, nonatomic, readonly) NSString* userFullName;
 
 // Cached Hashed Gaia ID. This is used to pass the currently signed in account
 // between apps.
-@property(nonatomic, readonly) NSString* hashedGaiaID;
+@property(weak, nonatomic, readonly) NSString* hashedGaiaID;
 
 @end
 
 #endif  // IOS_PUBLIC_PROVIDER_CHROME_BROWSER_SIGNIN_CHROME_IDENTITY_H_