Move a couple of utility functions to a new namespace_utils class.

sandbox/linux/services/credentials_unittest.cc

Index: sandbox/linux/services/credentials_unittest.cc
diff --git a/sandbox/linux/services/credentials_unittest.cc b/sandbox/linux/services/credentials_unittest.cc
index 4fc902323683b7dcdcfa9ede67a49b376c2aff2a..3ba78dd891a6eefc21c44a082d12a9fd943add38 100644
--- a/sandbox/linux/services/credentials_unittest.cc
+++ b/sandbox/linux/services/credentials_unittest.cc
@@ -71,9 +71,9 @@ SANDBOX_TEST(Credentials, MoveToNewUserNS) {
   CHECK(!Credentials::HasAnyCapability());
 }
 
-SANDBOX_TEST(Credentials, SupportsUserNS) {
+SANDBOX_TEST(Credentials, CanCreateProcessInNewUserNS) {
   CHECK(Credentials::DropAllCapabilities());
-  bool user_ns_supported = Credentials::SupportsNewUserNS();
+  bool user_ns_supported = Credentials::CanCreateProcessInNewUserNS();
   bool moved_to_new_ns = Credentials::MoveToNewUserNS();
   CHECK_EQ(user_ns_supported, moved_to_new_ns);
 }
@@ -153,7 +153,7 @@ SANDBOX_TEST(Credentials, DISABLE_ON_LSAN(CannotRegainPrivileges)) {
 
   // The kernel should now prevent us from regaining capabilities because we
   // are in a chroot.
-  CHECK(!Credentials::SupportsNewUserNS());
+  CHECK(!Credentials::CanCreateProcessInNewUserNS());
   CHECK(!Credentials::MoveToNewUserNS());
 }