[ObjC ARC] Converts ios/chrome/app/application_delegate:application_delegate_internal to ARC.

ios/chrome/app/application_delegate/url_opener.mm

 // Copyright 2016 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 "ios/chrome/app/application_delegate/url_opener.h"
 
 #import <Foundation/Foundation.h>
 
-#import "base/ios/weak_nsobject.h"
-#import "base/mac/scoped_nsobject.h"
 #include "base/metrics/histogram_macros.h"
 #import "ios/chrome/app/application_delegate/app_state.h"
 #import "ios/chrome/app/application_delegate/startup_information.h"
 #import "ios/chrome/app/application_delegate/tab_opening.h"
 #include "ios/chrome/app/chrome_app_startup_parameters.h"
 
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
 namespace {
 // Key of the UMA Startup.MobileSessionStartFromApps histogram.
 const char* const kUMAMobileSessionStartFromAppsHistogram =
     "Startup.MobileSessionStartFromApps";
 }  // namespace
 
 @implementation URLOpener
 
 - (instancetype)init {
   NOTREACHED();
   return nil;
 }
 
 #pragma mark - ApplicationDelegate - URL Opening methods
 
 + (BOOL)openURL:(NSURL*)url
      applicationActive:(BOOL)applicationActive
                options:(NSDictionary<NSString*, id>*)options
              tabOpener:(id<TabOpening>)tabOpener
     startupInformation:(id<StartupInformation>)startupInformation {
   NSString* sourceApplication =
       options[UIApplicationOpenURLOptionsSourceApplicationKey];
-  base::scoped_nsobject<ChromeAppStartupParameters> params(
-      [ChromeAppStartupParameters
-          newChromeAppStartupParametersWithURL:url
-                         fromSourceApplication:sourceApplication]);
+  ChromeAppStartupParameters* params = [ChromeAppStartupParameters
+      newChromeAppStartupParametersWithURL:url
+                     fromSourceApplication:sourceApplication];
 
   MobileSessionCallerApp callerApp = [params callerApp];
 
   UMA_HISTOGRAM_ENUMERATION(kUMAMobileSessionStartFromAppsHistogram, callerApp,
                             MOBILE_SESSION_CALLER_APP_COUNT);
 
   if (startupInformation.isPresentingFirstRunUI) {
     UMA_HISTOGRAM_ENUMERATION("FirstRun.LaunchSource", [params launchSource],
                               first_run::LAUNCH_SIZE);
   }
@@ skipping 35 matching lines @@
     BOOL openURLResult = [URLOpener openURL:url
                           applicationActive:applicationActive
                                     options:options
                                   tabOpener:tabOpener
                          startupInformation:startupInformation];
     [appState launchFromURLHandled:openURLResult];
   }
 }
 
 @end