Prevent leaking PDF data cross-origin

BUG=520422

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

Cr-Commit-Position: refs/heads/master@{#345267}
int OutOfProcessInstance::GetDocumentPixelHeight() const {
  return static_cast<int>(
      ceil(document_size_.height() * zoom_ * device_scale_));
}

int OutOfProcessInstance::GetDocumentPixelHeight() const {
  return static_cast<int>(
      ceil(document_size_.height() * zoom_ * device_scale_));
}
