Minor refactor to HandoffManager.

components/handoff/handoff_manager.mm

 // Copyright 2014 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.
 
 #include "components/handoff/handoff_manager.h"
 
 #include "base/logging.h"
 #include "base/mac/objc_property_releaser.h"
 #include "base/mac/scoped_nsobject.h"
 #include "net/base/mac/url_conversions.h"
@@ skipping 78 matching lines @@
 
   // No change to the user activity.
   const GURL userActivityURL(net::GURLWithNSURL(self.userActivity.webpageURL));
   if (userActivityURL == _activeURL)
     return;
 
   // Invalidate the old user activity and make a new one.
   [self.userActivity invalidate];
 
   Class aClass = NSClassFromString(@"NSUserActivity");
-  NSUserActivity* userActivity = [[aClass performSelector:@selector(alloc)]
-      performSelector:@selector(initWithActivityType:)
-           withObject:handoff::kChromeHandoffActivityType];
-  self.userActivity = base::scoped_nsobject<NSUserActivity>(userActivity);
+  base::scoped_nsobject<NSUserActivity> userActivity(
+      [[aClass performSelector:@selector(alloc)]
+          performSelector:@selector(initWithActivityType:)
+               withObject:handoff::kChromeHandoffActivityType]);
+  self.userActivity = userActivity;
   self.userActivity.webpageURL = net::NSURLWithGURL(_activeURL);
   NSString* origin = handoff::StringFromOrigin(_origin);
   DCHECK(origin);
   self.userActivity.userInfo = @{ handoff::kOriginKey : origin };
   [self.userActivity becomeCurrent];
 }
 
 @end
 
 @implementation HandoffManager (TestingOnly)
 
 - (NSURL*)userActivityWebpageURL {
   return self.userActivity.webpageURL;
 }
 
 @end