Add test to ensure that URLs that redirect inside the PDF plugin fail to load

pdf/pdfium/pdfium_engine.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "pdf/pdfium/pdfium_engine.h"
 
 #include <math.h>
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 1088 matching lines @@
   }
   file_access_.m_FileLen = doc_loader_->GetDocumentSize();
   if (!fpdf_availability_) {
     fpdf_availability_ = FPDFAvail_Create(&file_availability_, &file_access_);
     DCHECK(fpdf_availability_);
   }
   LoadDocument();
 }
 
 void PDFiumEngine::OnDocumentCanceled() {
-  OnDocumentComplete();
+  if (visible_pages_.empty())
+    client_->DocumentLoadFailed();
+  else
+    OnDocumentComplete();
 }
 
 void PDFiumEngine::CancelBrowserDownload() {
   client_->CancelBrowserDownload();
 }
 
 void PDFiumEngine::FinishLoadingDocument() {
   DCHECK(doc_loader_->IsDocumentComplete() && doc_);
 
   if (!form_) {
@@ skipping 2905 matching lines @@
   FPDF_DOCUMENT doc =
       FPDF_LoadMemDocument(pdf_buffer, pdf_buffer_size, nullptr);
   if (!doc)
     return false;
   bool success = FPDF_GetPageSizeByIndex(doc, page_number, width, height) != 0;
   FPDF_CloseDocument(doc);
   return success;
 }
 
 }  // namespace chrome_pdf