GitLab

Opaque FormData objects created from 'PasswordCredential::toFormData()'
need to persist their opacity through to Request objects, as defined in
https://w3c.github.io/webappsec/specs/credentialmanagement/#opaque-formdata-algorithms

This patch adjusts 'RequestInit', 'Body', and 'Request' such that opaque
'FormData' bodies lead to opaque 'Body' objects that reject read
attempts from JavaScript.

BUG=526995

Review URL: https://codereview.chromium.org/1305183009

git-svn-id: svn://svn.chromium.org/blink/trunk@201714 bbb929c8-8fbe-4397-9dbb-9b2b20218538