Add security OWNERs to mojo directories.

ui/gfx/mojo/OWNERS

Index: ui/gfx/mojo/OWNERS
diff --git a/url/mojo/OWNERS b/ui/gfx/mojo/OWNERS
similarity index 50%
copy from url/mojo/OWNERS
copy to ui/gfx/mojo/OWNERS
index 7a5a05aac931edea6e25fb35b7bc3d5fa3ffa2e0..d72222e39b76cf5aec914db531bbdf8f0cc3d722 100644
--- a/url/mojo/OWNERS
+++ b/ui/gfx/mojo/OWNERS
@@ -1,16 +1,16 @@
 # Changes to IPC serialization require a security review to avoid introducing
 # new sandbox escapes.
-per-file url_gurl_struct_traits.h=set noparent
-per-file url_gurl_struct_traits.h=dcheng@chromium.org
-per-file url_gurl_struct_traits.h=inferno@chromium.org
-per-file url_gurl_struct_traits.h=jln@chromium.org
-per-file url_gurl_struct_traits.h=jschuh@chromium.org
-per-file url_gurl_struct_traits.h=kenrb@chromium.org
-per-file url_gurl_struct_traits.h=mkwst@chromium.org
-per-file url_gurl_struct_traits.h=nasko@chromium.org
-per-file url_gurl_struct_traits.h=palmer@chromium.org
-per-file url_gurl_struct_traits.h=tsepez@chromium.org
-per-file url_gurl_struct_traits.h=wfh@chromium.org
+per-file *struct_traits*.*=set noparent
+per-file *struct_traits*.*=dcheng@chromium.org
+per-file *struct_traits*.*=inferno@chromium.org
+per-file *struct_traits*.*=jln@chromium.org
+per-file *struct_traits*.*=jschuh@chromium.org
+per-file *struct_traits*.*=kenrb@chromium.org
+per-file *struct_traits*.*=mkwst@chromium.org
+per-file *struct_traits*.*=nasko@chromium.org
+per-file *struct_traits*.*=palmer@chromium.org
+per-file *struct_traits*.*=tsepez@chromium.org
+per-file *struct_traits*.*=wfh@chromium.org
 
 # Changes to Mojo interfaces require a security review to avoid
 # introducing new sandbox escapes.