Use scoped_ptr to document ownership in InstantUnloadHandler.

chrome/browser/instant/instant_service.h

 // Copyright 2013 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.
 
 #ifndef CHROME_BROWSER_INSTANT_INSTANT_SERVICE_H_
 #define CHROME_BROWSER_INSTANT_INSTANT_SERVICE_H_
 
 #include <set>
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "chrome/browser/profiles/profile_keyed_service.h"
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
 
-// Tracks render process host ids that are associated with Instant.
+// Tracks render process host IDs that are associated with Instant.
 class InstantService : public ProfileKeyedService,
                        public content::NotificationObserver {
  public:
   InstantService();
   virtual ~InstantService();
 
   // Add, remove, and query RenderProcessHost IDs that are associated with
   // Instant processes.
   void AddInstantProcess(int process_id);
   bool IsInstantProcess(int process_id) const;
 
-  // For testing.
-  int GetInstantProcessCount() const;
+#if defined(UNIT_TEST)
+  int GetInstantProcessCount() const {
+    return process_ids_.size();
+  }
+#endif
 
  private:
-  // ProfileKeyedService:
+  // Overridden from ProfileKeyedService:
   virtual void Shutdown() OVERRIDE;
 
+  // Overridden from content::NotificationObserver:
   virtual void Observe(int type,
                        const content::NotificationSource& source,
                        const content::NotificationDetails& details) OVERRIDE;
 
   // The process ids associated with Instant processes.
   std::set<int> process_ids_;
 
   content::NotificationRegistrar registrar_;
 
   DISALLOW_COPY_AND_ASSIGN(InstantService);
 };
 
 #endif  // CHROME_BROWSER_INSTANT_INSTANT_SERVICE_H_