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 7364b32714bbf2727e32319515812af7c7d89866..c745963ec0de988c93c6ba13c73d853a76a41803 100644
--- a/chrome/browser/certificate_manager_model.h
+++ b/chrome/browser/certificate_manager_model.h
@@ -11,9 +11,12 @@
 #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"
 
+class CertDatabaseServiceIOPart;
+
 namespace content {
 class BrowserContext;
 class ResourceContext;
@@ -50,7 +53,7 @@ class CertificateManagerModel {
   // Creates a CertificateManagerModel. The model will be passed to the callback
   // when it is ready. The caller must ensure the model does not outlive the
   // |browser_context|.
-  static void Create(content::BrowserContext* browser_context,
+  static void Create(content::BrowserContext* context,
                      Observer* observer,
                      const CreationCallback& callback);
 
@@ -138,9 +141,10 @@ 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<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.