Downgrade the security of a secured page when plugins make insecure calls

Send message for lowering the security of a page when context of the
request is ContextTypeShouldBeBlockable.

BUG=432485

Review URL: https://codereview.chromium.org/768753003

git-svn-id: svn://svn.chromium.org/blink/trunk@187260 bbb929c8-8fbe-4397-9dbb-9b2b20218538
3 files changed
tree: a95b23ae863b42b07e264d339d4e6609269c6e6a
  1. third_party/