Add Content-Type header to net::ReportSender reports

chrome/browser/safe_browsing/mock_permission_report_sender.h

Index: chrome/browser/safe_browsing/mock_permission_report_sender.h
diff --git a/chrome/browser/safe_browsing/mock_permission_report_sender.h b/chrome/browser/safe_browsing/mock_permission_report_sender.h
index fc1c92ee8c469fa8566c606caa5f1e19e242df9e..e8d6b76ca4190fe78eaeb0732320b59594adf6d7 100644
--- a/chrome/browser/safe_browsing/mock_permission_report_sender.h
+++ b/chrome/browser/safe_browsing/mock_permission_report_sender.h
@@ -17,12 +17,16 @@ class MockPermissionReportSender : public net::ReportSender {
 
   ~MockPermissionReportSender() override;
 
-  void Send(const GURL& report_uri, const std::string& report) override;
+  void Send(const GURL& report_uri,
+            base::StringPiece content_type,
+            base::StringPiece report) override;
 
   const GURL& latest_report_uri();
 
   const std::string& latest_report();
 
+  const std::string& latest_content_type();
+
   int GetAndResetNumberOfReportsSent();
 
   void WaitForReportSent();
@@ -30,6 +34,7 @@ class MockPermissionReportSender : public net::ReportSender {
  private:
   GURL latest_report_uri_;
   std::string latest_report_;
+  std::string latest_content_type_;
   int number_of_reports_;
   base::Closure quit_closure_;