Revert IDL compiler build flow to Perl, rename 'deprecated'

Source/bindings/scripts/unstable/v8_attributes.py

Index: Source/bindings/scripts/unstable/v8_attributes.py
diff --git a/Source/bindings/scripts/v8_attributes.py b/Source/bindings/scripts/unstable/v8_attributes.py
similarity index 91%
rename from Source/bindings/scripts/v8_attributes.py
rename to Source/bindings/scripts/unstable/v8_attributes.py
index 6d5ef4e9084a639d7c39c9f372b53f676886b1f7..802f51a28440249a3c78deee58510c6b281a1366 100644
--- a/Source/bindings/scripts/v8_attributes.py
+++ b/Source/bindings/scripts/unstable/v8_attributes.py
@@ -26,7 +26,14 @@
 # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-"""Generate template values for attributes."""
+"""Generate template values for attributes.
+
+FIXME: Not currently used in build.
+This is a rewrite of the Perl IDL compiler in Python, but is not complete.
+Once it is complete, we will switch all IDL files over to Python at once.
+Until then, please work on the Perl IDL compiler.
+For details, see bug http://crbug.com/239771
+"""
 
 import v8_types
 import v8_utilities