Add Content-Type header to net::ReportSender reports

chrome/browser/safe_browsing/mock_permission_report_sender.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 CHROME_BROWSER_SAFE_BROWSING_MOCK_PERMISSION_REPORT_SENDER_H_
 #define CHROME_BROWSER_SAFE_BROWSING_MOCK_PERMISSION_REPORT_SENDER_H_
 
 #include "net/url_request/report_sender.h"
 
 namespace safe_browsing {
 
 // A mock ReportSender that keeps track of the last report sent and the number
 // of reports sent.
 class MockPermissionReportSender : public net::ReportSender {
  public:
   MockPermissionReportSender();
 
   ~MockPermissionReportSender() override;
 
   void Send(const GURL& report_uri, const std::string& report) override;
 
+  void SetContentTypeHeader(const std::string& content_type) override {}
+
   const GURL& latest_report_uri();
 
   const std::string& latest_report();
 
   int GetAndResetNumberOfReportsSent();
 
   void WaitForReportSent();
 
  private:
   GURL latest_report_uri_;
   std::string latest_report_;
   int number_of_reports_;
   base::Closure quit_closure_;
 
   void NotifyReportSentOnUIThread();
 
   DISALLOW_COPY_AND_ASSIGN(MockPermissionReportSender);
 };
 
 }  // namespace safe_browsing
 
 #endif  // CHROME_BROWSER_SAFE_BROWSING_MOCK_PERMISSION_REPORT_SENDER_H_