Replace c/b/nss_context by a KeyedService.

chrome/browser/certificate_manager_model.h

Index: chrome/browser/certificate_manager_model.h
diff --git a/chrome/browser/certificate_manager_model.h b/chrome/browser/certificate_manager_model.h
index 34d0f0786f29b2491e918d725508f12be2c90234..ec904ed83d2f0485a91e1f869b43298a093420f0 100644
--- a/chrome/browser/certificate_manager_model.h
+++ b/chrome/browser/certificate_manager_model.h
@@ -11,13 +11,18 @@
 #include "base/callback.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
+#include "base/memory/weak_ptr.h"
 #include "base/strings/string16.h"
 #include "net/cert/nss_cert_database.h"
 
+namespace cert_database {
+class CertDatabaseServiceIOPart;
+}
+
 namespace content {
 class BrowserContext;
 class ResourceContext;
-}  // namespace content
+}
 
 // CertificateManagerModel provides the data to be displayed in the certificate
 // manager dialog, and processes changes from the view.
@@ -141,9 +146,11 @@ class CertificateManagerModel {
       CertificateManagerModel::Observer* observer,
       const CreationCallback& callback,
       net::NSSCertDatabase* cert_db);
-  static void GetCertDBOnIOThread(content::ResourceContext* context,
-                                  CertificateManagerModel::Observer* observer,
-                                  const CreationCallback& callback);
+  static void GetCertDBOnIOThread(
+      base::WeakPtr<cert_database::CertDatabaseServiceIOPart>
+          cert_db_service_io,
+      CertificateManagerModel::Observer* observer,
+      const CreationCallback& callback);
 
   // Callback used by Refresh() for when the cert slots have been unlocked.
   // This method does the actual refreshing.