Move kChromeSearchScheme out of content since it's a chrome feature.

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.
-class InstantService : public ProfileKeyedService {
+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);
-  void RemoveInstantProcess(int process_id);
   bool IsInstantProcess(int process_id) const;
 
   // For testing.
   int GetInstantProcessCount() const;
 
  private:
   // ProfileKeyedService:
   virtual void Shutdown() OVERRIDE;
 
+  virtual void Observe(int type,
+                        const content::NotificationSource& source,

[dhollowa, 2013/02/01 16:56:11]

nit: indent

[jam, 2013/02/01 17:09:14]

Done.

+                        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_