Replace c/b/nss_context by a KeyedService.

net/cert/nss_profile_filter_chromeos.h

Index: net/cert/nss_profile_filter_chromeos.h
diff --git a/net/cert/nss_profile_filter_chromeos.h b/net/cert/nss_profile_filter_chromeos.h
index 36c42d007edf98cfe09c66ed9c494e10e900a137..0be014b745f92e18905c741251ff13786b93727a 100644
--- a/net/cert/nss_profile_filter_chromeos.h
+++ b/net/cert/nss_profile_filter_chromeos.h
@@ -5,6 +5,8 @@
 #ifndef NET_CERT_NSS_PROFILE_FILTER_CHROMEOS_H_
 #define NET_CERT_NSS_PROFILE_FILTER_CHROMEOS_H_
 
+#include "base/callback_forward.h"
+#include "base/macros.h"
 #include "base/memory/scoped_ptr.h"
 #include "crypto/scoped_nss_types.h"
 #include "net/base/crypto_module.h"
@@ -68,6 +70,16 @@ class NET_EXPORT NSSProfileFilterChromeOS {
   crypto::ScopedPK11Slot system_slot_;
 };
 
+class NET_EXPORT NSSProfileFilterChromeOSFactory {
+ public:
+  virtual ~NSSProfileFilterChromeOSFactory() {}
+  virtual scoped_ptr<NSSProfileFilterChromeOS> CreateFilter(
+      const base::Callback<void(const NSSProfileFilterChromeOS&)>&) = 0;
+
+ private:
+  DISALLOW_ASSIGN(NSSProfileFilterChromeOSFactory);
+};
+
 }  // namespace net
 
 #endif  // NET_CERT_NSS_PROFILE_FILTER_CHROMEOS_H_