Inherit CSP when we inherit the security origin

This prevents attacks that use main window navigation to get out of the
existing csp constraints such as the related bug

Bug: 747847
Change-Id: I1e57b50da17f65d38088205b0a3c7c49ef2ae4d8
Reviewed-on: https://chromium-review.googlesource.com/592027
Reviewed-by: Mike West <mkwst@chromium.org>
Commit-Queue: Andy Paicu <andypaicu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#492333}
void WebLocalFrameImpl::SetInputEventsScaleForEmulation(
    float content_scale_factor) {
  input_events_scale_factor_for_emulation_ = content_scale_factor;
  if (GetFrame()->View()) {
    GetFrame()->View()->SetInputEventsScaleForEmulation(
        input_events_scale_factor_for_emulation_);
  }
}

void WebLocalFrameImpl::SetInputEventsScaleForEmulation(
    float content_scale_factor) {
  input_events_scale_factor_for_emulation_ = content_scale_factor;
  if (GetFrame()->View()) {
    GetFrame()->View()->SetInputEventsScaleForEmulation(
        input_events_scale_factor_for_emulation_);
  }
}
