[ObjC ARC] Converts components/autofill/ios/browser:browser to ARC.

components/autofill/ios/browser/personal_data_manager_observer_bridge.mm

 // 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.
 
 #import "components/autofill/ios/browser/personal_data_manager_observer_bridge.h"
 
 #include "base/logging.h"
 
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
 namespace autofill {
 
 PersonalDataManagerObserverBridge::PersonalDataManagerObserverBridge(
     id<PersonalDataManagerObserverBridgeDelegate> delegate)
     : delegate_(delegate) {
   DCHECK(delegate_);
 }
 
 PersonalDataManagerObserverBridge::~PersonalDataManagerObserverBridge() {
 }
 
 void PersonalDataManagerObserverBridge::OnPersonalDataChanged() {
   [delegate_ onPersonalDataChanged];
 }
 
 void PersonalDataManagerObserverBridge::OnInsufficientFormData() {
   if ([delegate_ respondsToSelector:@selector(onInsufficientFormData)])
     [delegate_ onInsufficientFormData];
 }
 
 }  // namespace autofill