cashew: libcurl http fetcher: use default CA certificate path

src/libcurl_http_fetcher.h

 // Copyright (c) 2009 The Chromium OS Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // NOTE: lifted from src/platform/update_engine and tweaked for cashew
 // TODO(vlaviano): see http_fetcher.h
 
 #ifndef SRC_LIBCURL_HTTP_FETCHER_H_
 #define SRC_LIBCURL_HTTP_FETCHER_H_
 
@@ skipping 49 matching lines @@
   //     if libcurl returns a -1 timeout here, it just means that libcurl
   //     currently has no stored timeout value. You must not wait too long
   //     (more than a few seconds perhaps) before you call
   //     curl_multi_perform() again.
   void set_idle_seconds(int seconds) { idle_seconds_ = seconds; }
 
   // Sets the retry timeout. Useful for testing.
   void set_retry_seconds(int seconds) { retry_seconds_ = seconds; }
 
  private:
+  // Asks libcurl for the http response code and stores it in the object.
+  void GetHttpResponseCode();
+
   // Resumes a transfer where it left off. This will use the
   // HTTP Range: header to make a new connection from where the last
   // left off.
   virtual void ResumeTransfer(const std::string& url);
 
   // These two methods are for glib main loop callbacks. They are called
   // when either a file descriptor is ready for work or when a timer
   // has fired. The static versions are shims for libcurl which has a C API.
   bool FDCallback(GIOChannel *source, GIOCondition condition);
   static gboolean StaticFDCallback(GIOChannel *source,
@@ skipping 70 matching lines @@
 
   // Seconds to wait before asking libcurl to "perform".
   int idle_seconds_;
 
   DISALLOW_COPY_AND_ASSIGN(LibcurlHttpFetcher);
 };
 
 }  // namespace cashew
 
 #endif  // SRC_LIBCURL_HTTP_FETCHER_H_