[ObjC ARC] Converts ios/chrome/browser/ui/settings:settings to ARC.

ios/chrome/browser/ui/settings/reauthentication_module.mm

Index: ios/chrome/browser/ui/settings/reauthentication_module.mm
diff --git a/ios/chrome/browser/ui/settings/reauthentication_module.mm b/ios/chrome/browser/ui/settings/reauthentication_module.mm
index 1c7e35505b7c7dbb5fed818cde2fceb49cdfb7a9..dbffe5ded4ad3122bc41b77426dd3ebaf42914c9 100644
--- a/ios/chrome/browser/ui/settings/reauthentication_module.mm
+++ b/ios/chrome/browser/ui/settings/reauthentication_module.mm
@@ -5,18 +5,20 @@
 
 #import <LocalAuthentication/LocalAuthentication.h>
 
-#import "base/ios/weak_nsobject.h"
-#import "base/mac/scoped_nsobject.h"
+#import "base/logging.h"
+
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
 
 @implementation ReauthenticationModule {
   // Authentication context on which the authentication policy is evaluated.
-  base::scoped_nsobject<LAContext> _context;
+  LAContext* _context;
 
   // Accessor allowing the module to request the update of the time when the
   // successful re-authentication was performed and to get the time of the last
   // successful re-authentication.
-  base::WeakNSProtocol<id<SuccessfulReauthTimeAccessor>>
-      _successfulReauthTimeAccessor;
+  __weak id<SuccessfulReauthTimeAccessor> _successfulReauthTimeAccessor;
 }
 
 - (instancetype)initWithSuccessfulReauthTimeAccessor:
@@ -24,8 +26,8 @@
   DCHECK(successfulReauthTimeAccessor);
   self = [super init];
   if (self) {
-    _context.reset([[LAContext alloc] init]);
-    _successfulReauthTimeAccessor.reset(successfulReauthTimeAccessor);
+    _context = [[LAContext alloc] init];
+    _successfulReauthTimeAccessor = successfulReauthTimeAccessor;
   }
   return self;
 }
@@ -43,21 +45,19 @@
     return;
   }
 
-  _context.reset([[LAContext alloc] init]);
+  _context = [[LAContext alloc] init];
 
   // No fallback option is provided.
-  _context.get().localizedFallbackTitle = @"";
+  _context.localizedFallbackTitle = @"";
 
-  base::WeakNSObject<ReauthenticationModule> weakSelf(self);
+  __weak ReauthenticationModule* weakSelf = self;
   void (^replyBlock)(BOOL, NSError*) = ^(BOOL success, NSError* error) {
     dispatch_async(dispatch_get_main_queue(), ^{
-      base::scoped_nsobject<ReauthenticationModule> strongSelf(
-          [weakSelf retain]);
+      ReauthenticationModule* strongSelf = weakSelf;
       if (!strongSelf)
         return;
       if (success) {
-        [strongSelf.get()
-                ->_successfulReauthTimeAccessor updateSuccessfulReauthTime];
+        [strongSelf->_successfulReauthTimeAccessor updateSuccessfulReauthTime];
       }
       handler(success);
     });