Revert "reland of Improve linearized pdf load/show time."

pdf/pdfium/pdfium_engine.h

Index: pdf/pdfium/pdfium_engine.h
diff --git a/pdf/pdfium/pdfium_engine.h b/pdf/pdfium/pdfium_engine.h
index 0334a602433e801f199023f35b8f4e31e03e6837..a71f0886ae2525ecc0f6f4b35ff1de802846135f 100644
--- a/pdf/pdfium/pdfium_engine.h
+++ b/pdf/pdfium/pdfium_engine.h
@@ -108,16 +108,17 @@ class PDFiumEngine : public PDFEngine,
 #if defined(PDF_ENABLE_XFA)
   void SetScrollPosition(const pp::Point& position) override;
 #endif
+  bool IsProgressiveLoad() override;
   std::string GetMetadata(const std::string& key) override;
 
   // DocumentLoader::Client implementation.
   pp::Instance* GetPluginInstance() override;
-  std::unique_ptr<URLLoaderWrapper> CreateURLLoader() override;
+  pp::URLLoader CreateURLLoader() override;
+  void OnPartialDocumentLoaded() override;
   void OnPendingRequestComplete() override;
   void OnNewDataAvailable() override;
+  void OnDocumentFailed() override;
   void OnDocumentComplete() override;
-  void OnDocumentCanceled() override;
-  void CancelBrowserDownload() override;
 
   void UnsupportedFeature(int type);
   void FontSubstituted();
@@ -191,11 +192,11 @@ class PDFiumEngine : public PDFEngine,
   friend class SelectionChangeInvalidator;
 
   struct FileAvail : public FX_FILEAVAIL {
-    PDFiumEngine* engine;
+    DocumentLoader* loader;
   };
 
   struct DownloadHints : public FX_DOWNLOADHINTS {
-    PDFiumEngine* engine;
+    DocumentLoader* loader;
   };
 
   // PDFium interface to get block of data.
@@ -602,7 +603,7 @@ class PDFiumEngine : public PDFEngine,
   double current_zoom_;
   unsigned int current_rotation_;
 
-  std::unique_ptr<DocumentLoader> doc_loader_;  // Main document's loader.
+  DocumentLoader doc_loader_;  // Main document's loader.
   std::string url_;
   std::string headers_;
   pp::CompletionCallbackFactory<PDFiumEngine> find_factory_;
@@ -731,11 +732,6 @@ class PDFiumEngine : public PDFEngine,
   // to false after the user finishes getting their password.
   bool getting_password_;
 
-  // While true, the document try to be opened and parsed after download each
-  // part. Else the document will be opened and parsed only on finish of
-  // downloading.
-  bool process_when_pending_request_complete_ = true;
-
   DISALLOW_COPY_AND_ASSIGN(PDFiumEngine);
 };