Implement CUP signing in UpdateClient.

components/update_client/client_update_protocol_ecdsa.h

Index: components/update_client/client_update_protocol_ecdsa.h
diff --git a/components/update_client/client_update_protocol_ecdsa.h b/components/update_client/client_update_protocol_ecdsa.h
index 679662687c964b4dc32ddc4977731f69129c8cb5..2459c8c8bee5a6cfe01ebb6a90c3ebb9ccd65084 100644
--- a/components/update_client/client_update_protocol_ecdsa.h
+++ b/components/update_client/client_update_protocol_ecdsa.h
@@ -13,6 +13,8 @@
 #include "base/memory/scoped_ptr.h"
 #include "base/strings/string_piece.h"
 
+namespace update_client {
+
 // Client Update Protocol v2, or CUP-ECDSA, is used by Google Update (Omaha)
 // servers to ensure freshness and authenticity of update checks over HTTP,
 // without the overhead of HTTPS -- namely, no PKI, no guarantee of privacy,
@@ -81,4 +83,6 @@ class ClientUpdateProtocolEcdsa {
   DISALLOW_IMPLICIT_CONSTRUCTORS(ClientUpdateProtocolEcdsa);
 };
 
+}  // namespace update_client
+
 #endif  // COMPONENTS_UPDATE_CLIENT_CLIENT_UPDATE_PROTOCOL_ECDSA_H_