Oilpan: Enable Oilpan by default in modules/encryptedmedia

This CL changes generated bindings so that both toV8(RawPtr<X>) and toV8(X*) are generated. Otherwise, if someone uses RawPtr<X> instead of X* in the code base, it can be bound to unexpected toV8() and a wrong wrapper can be returned to V8. For more details, see my comment in the patch set 3.

BUG=340522

Review URL: https://codereview.chromium.org/257503003

git-svn-id: svn://svn.chromium.org/blink/trunk@175248 bbb929c8-8fbe-4397-9dbb-9b2b20218538