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

pdf/url_loader_wrapper.h

-// Copyright 2016 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_URL_LOADER_WRAPPER_H_
-#define PDF_URL_LOADER_WRAPPER_H_
-
-#include <string>
-
-#include "base/macros.h"
-#include "ppapi/cpp/completion_callback.h"
-
-namespace chrome_pdf {
-
-class URLLoaderWrapper {
- public:
-  virtual ~URLLoaderWrapper() {}
-
-  // Returns length of content, will be -1, if it is unknown.
-  virtual int GetContentLength() const = 0;
-  // Returns if the response headers contains "accept-ranges".
-  virtual bool IsAcceptRangesBytes() const = 0;
-  // Returns if the content encoded in response.
-  virtual bool IsContentEncoded() const = 0;
-  // Returns response content type.
-  virtual std::string GetContentType() const = 0;
-  // Returns response content disposition.
-  virtual std::string GetContentDisposition() const = 0;
-  // Returns response status code.
-  virtual int GetStatusCode() const = 0;
-  // Returns if the response contains multi parts.
-  virtual bool IsMultipart() const = 0;
-  // If true, [start,end] - is byte range contains in response (include end).
-  // If false, response contains full document, start/end will be undefined.
-  virtual bool GetByteRange(int* start, int* end) const = 0;
-
-  // Close connection.
-  virtual void Close() = 0;
-  // Open new connection and send http range request.
-  virtual void OpenRange(const std::string& url,
-                         const std::string& referrer_url,
-                         uint32_t position,
-                         uint32_t size,
-                         const pp::CompletionCallback& cc) = 0;
-  // Read the response body. The size of the buffer must be large enough to
-  // hold the specified number of bytes to read.
-  // This function might perform a partial read.
-  virtual void ReadResponseBody(char* buffer,
-                                int buffer_size,
-                                const pp::CompletionCallback& cc) = 0;
-  // Returns the current download progress.
-  // Progress only refers to the response body and does not include the headers.
-  // If false, progress is unknown, bytes_received/total_bytes_to_be_received
-  // will be undefined.
-  virtual bool GetDownloadProgress(
-      int64_t* bytes_received,
-      int64_t* total_bytes_to_be_received) const = 0;
-};
-
-}  // namespace chrome_pdf
-
-#endif  // PDF_URL_LOADER_WRAPPER_H_