Update bindings gn files for binding modularization.

bindings gyp files support but gn files are old and doesn't support binding modularization. e.g.
- create WindowCoreConstructors.idl and WindowModulesConstructors.idl instead of WindowConstructors.idl,
- ditto (SharedWorkderGlobalScope, DedicatedWorkerGlobalScope, ServiceWorkerGlobalScope).

BUG=358074

Review URL: https://codereview.chromium.org/633913002

git-svn-id: svn://svn.chromium.org/blink/trunk@183786 bbb929c8-8fbe-4397-9dbb-9b2b20218538