PDF: Set a referrer when performing a SaveAs operation.

components/pdf/renderer/pepper_pdf_host.cc

Index: components/pdf/renderer/pepper_pdf_host.cc
diff --git a/components/pdf/renderer/pepper_pdf_host.cc b/components/pdf/renderer/pepper_pdf_host.cc
index eea157f86cd1fce64b917985a12804be899a3eb2..99fcd7b0ff74a657ca9e9b77493116daefd26114 100644
--- a/components/pdf/renderer/pepper_pdf_host.cc
+++ b/components/pdf/renderer/pepper_pdf_host.cc
@@ -153,11 +153,10 @@ int32_t PepperPDFHost::OnHostMsgSaveAs(
     return PP_ERROR_FAILED;
   GURL url = instance->GetPluginURL();
   content::RenderView* render_view = instance->GetRenderView();
-  blink::WebLocalFrame* frame =
-      render_view->GetWebView()->mainFrame()->toWebLocalFrame();
-  content::Referrer referrer = content::Referrer::SanitizeForRequest(
-      url, content::Referrer(frame->document().url(),
-                             frame->document().referrerPolicy()));
+  content::Referrer referrer;
+  referrer.url = url;
+  referrer.policy = blink::WebReferrerPolicyDefault;
+  referrer = content::Referrer::SanitizeForRequest(url, referrer);
   render_view->Send(
       new PDFHostMsg_PDFSaveURLAs(render_view->GetRoutingID(), url, referrer));
   return PP_OK;