Split WarningService from ExtensionSystem.

chrome/browser/extensions/extension_warning_badge_service.h

Index: chrome/browser/extensions/extension_warning_badge_service.h
diff --git a/chrome/browser/extensions/extension_warning_badge_service.h b/chrome/browser/extensions/extension_warning_badge_service.h
index c1887b411e6e019e9ce7152faf71f4b5e6c87a53..70f5ca0a79e65422b2ec2272050aebf2ce354c40 100644
--- a/chrome/browser/extensions/extension_warning_badge_service.h
+++ b/chrome/browser/extensions/extension_warning_badge_service.h
@@ -7,6 +7,7 @@
 
 #include "base/compiler_specific.h"
 #include "base/threading/non_thread_safe.h"
+#include "components/keyed_service/core/keyed_service.h"
 #include "extensions/browser/warning_service.h"
 #include "extensions/browser/warning_set.h"
 
@@ -18,12 +19,15 @@ namespace extensions {
 
 // A service that is responsible for showing an extension warning badge on the
 // wrench menu.
-class ExtensionWarningBadgeService : public WarningService::Observer,
+class ExtensionWarningBadgeService : public KeyedService,
+                                     public WarningService::Observer,
                                      public base::NonThreadSafe {
  public:
   explicit ExtensionWarningBadgeService(Profile* profile);
   virtual ~ExtensionWarningBadgeService();
 
+  static ExtensionWarningBadgeService* Get(content::BrowserContext* context);
+
   // Black lists all currently active extension warnings, so that they do not
   // trigger a warning badge again for the life-time of the browsing session.
   void SuppressCurrentWarnings();
@@ -41,6 +45,9 @@ class ExtensionWarningBadgeService : public WarningService::Observer,
 
   Profile* profile_;
 
+  ScopedObserver<WarningService, WarningService::Observer>
+      warning_service_observer_;
+
   // Warnings that do not trigger a badge on the wrench menu.
   WarningSet suppressed_warnings_;