Prevent leaking PDF data cross-origin

BUG=520422

Review URL: https://codereview.chromium.org/1311973002

Cr-Commit-Position: refs/heads/master@{#345267}
void OutOfProcessInstance::Scroll(const pp::Point& point) {
  if (!image_data_.is_null())
    paint_manager_.ScrollRect(available_area_, point);
}

void OutOfProcessInstance::Scroll(const pp::Point& point) {
  if (!image_data_.is_null())
    paint_manager_.ScrollRect(available_area_, point);
}
