Make CapabilityFilter be part of Identity

mojo/shell/capability_filter.cc

Index: mojo/shell/capability_filter.cc
diff --git a/mojo/shell/capability_filter.cc b/mojo/shell/capability_filter.cc
index be595e0a827702f89f669e1d79c9b51cd5d733a9..77cc61d093e5b2494b31c3fc01a96219930f1780 100644
--- a/mojo/shell/capability_filter.cc
+++ b/mojo/shell/capability_filter.cc
@@ -20,7 +20,7 @@ CapabilityFilter GetPermissiveCapabilityFilter() {
 AllowedInterfaces GetAllowedInterfaces(const CapabilityFilter& filter,
                                        const Identity& identity) {
   // Start by looking for interfaces specific to the supplied identity.
-  auto it = filter.find(identity.url.spec());
+  auto it = filter.find(identity.url().spec());
   if (it != filter.end())
     return it->second;