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

ios/chrome/browser/ui/ntp/google_landing_mediator.mm

Index: ios/chrome/browser/ui/ntp/google_landing_mediator.mm
diff --git a/ios/chrome/browser/ui/ntp/google_landing_mediator.mm b/ios/chrome/browser/ui/ntp/google_landing_mediator.mm
index 47ae5c43e87f33a41bef14c82233d5e9dc833fc3..cda99e6589b60097d23211fb208264283cc44448 100644
--- a/ios/chrome/browser/ui/ntp/google_landing_mediator.mm
+++ b/ios/chrome/browser/ui/ntp/google_landing_mediator.mm
@@ -4,8 +4,6 @@
 
 #import "ios/chrome/browser/ui/ntp/google_landing_mediator.h"
 
-#import "base/ios/weak_nsobject.h"
-#include "base/mac/scoped_nsobject.h"
 #include "base/metrics/user_metrics.h"
 #include "base/metrics/user_metrics_action.h"
 #include "base/strings/sys_string_conversions.h"
@@ -38,6 +36,10 @@
 #import "ios/shared/chrome/browser/ui/commands/command_dispatcher.h"
 #include "ios/web/public/web_state/web_state.h"
 
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
 using base::UserMetricsAction;
 
 namespace {
@@ -63,7 +65,7 @@ class SearchEngineObserver : public TemplateURLServiceObserver {
   void OnTemplateURLServiceChanged() override;
 
  private:
-  base::WeakNSObject<GoogleLandingMediator> _owner;
+  __weak GoogleLandingMediator* _owner;
   TemplateURLService* _templateURLService;  // weak
 };
 
@@ -93,7 +95,7 @@ void SearchEngineObserver::OnTemplateURLServiceChanged() {
   BOOL _recordedPageImpression;
 
   // Controller to fetch and show doodles or a default Google logo.
-  base::scoped_nsprotocol<id<LogoVendor>> _doodleController;
+  id<LogoVendor> _doodleController;
 
   // Listen for default search engine changes.
   std::unique_ptr<google_landing::SearchEngineObserver> _observer;
@@ -118,13 +120,13 @@ void SearchEngineObserver::OnTemplateURLServiceChanged() {
 }
 
 // Consumer to handle google landing update notifications.
-@property(nonatomic) id<GoogleLandingConsumer> consumer;
+@property(weak, nonatomic) id<GoogleLandingConsumer> consumer;
 
 // The WebStateList that is being observed by this mediator.
 @property(nonatomic, assign) WebStateList* webStateList;
 
 // The dispatcher for this mediator.
-@property(nonatomic, assign) id<ChromeExecuteCommand, UrlLoader> dispatcher;
+@property(nonatomic, weak) id<ChromeExecuteCommand, UrlLoader> dispatcher;
 
 // Most visited data from the MostVisitedSites service (copied upon receiving
 // the callback), not yet used.
@@ -191,8 +193,8 @@ void SearchEngineObserver::OnTemplateURLServiceChanged() {
   _observer.reset(
       new google_landing::SearchEngineObserver(self, _templateURLService));
   _templateURLService->Load();
-  _doodleController.reset(ios::GetChromeBrowserProvider()->CreateLogoVendor(
-      _browserState, self.dispatcher));
+  _doodleController = ios::GetChromeBrowserProvider()->CreateLogoVendor(
+      _browserState, self.dispatcher);
   [_consumer setLogoVendor:_doodleController];
   [self updateShowLogo];
 
@@ -371,9 +373,8 @@ void SearchEngineObserver::OnTemplateURLServiceChanged() {
   }
 
   if (_notification_promo->IsChromeCommand()) {
-    base::scoped_nsobject<GenericChromeCommand> command(
-        [[GenericChromeCommand alloc]
-            initWithTag:_notification_promo->command_id()]);
+    GenericChromeCommand* command = [[GenericChromeCommand alloc]
+        initWithTag:_notification_promo->command_id()];
     [self.dispatcher chromeExecuteCommand:command];
     return;
   }