Move bindings_modules_generated from modules to bindings/modules

There's a missing dependency b/c core_generated (webcore_generated) depends on modules_generated, due to partial interface definitions in modules extending classes in core.
This will require significant work to fix (changing how we handle bindings for partial interface definitions), so for now move these files to bindings_modules_generated.
This means we have a core -> bindings_modules dependency (which is allowed), instead of a core -> modules dependency (which is not allowed).

This CL is a work-around until we split the files in bindings for core and modules eventually.

BUG=378808

Review URL: https://codereview.chromium.org/308743004

git-svn-id: svn://svn.chromium.org/blink/trunk@175296 bbb929c8-8fbe-4397-9dbb-9b2b20218538