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

pdf/document_loader.h

 // Copyright (c) 2010 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.
 
 #ifndef PDF_DOCUMENT_LOADER_H_
 #define PDF_DOCUMENT_LOADER_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 21 matching lines @@
     // Notification called when partial information about document is available.
     // Only called for urls that returns full content size and supports byte
     // range requests.
     virtual void OnPartialDocumentLoaded() = 0;
     // Notification called when all outstanding pending requests are complete.
     virtual void OnPendingRequestComplete() = 0;
     // Notification called when new data is available.
     virtual void OnNewDataAvailable() = 0;
     // Notification called when document is fully loaded.
     virtual void OnDocumentComplete() = 0;
+    // Notification called if the document unrecoverably fails to load.
+    virtual void DocumentLoadFailed() = 0;
   };
 
   explicit DocumentLoader(Client* client);
   ~DocumentLoader();
 
   bool Init(const pp::URLLoader& loader,
             const std::string& url,
             const std::string& headers);
 
   // Data access interface. Return true is successful.
@@ skipping 75 matching lines @@
   bool header_request_;
   bool is_multipart_;
   std::string multipart_boundary_;
   uint32_t requests_count_;
   std::vector<std::vector<unsigned char> > chunk_buffer_;
 };
 
 }  // namespace chrome_pdf
 
 #endif  // PDF_DOCUMENT_LOADER_H_