Add Content-Type header to net::ReportSender reports

chrome/browser/ssl/chrome_expect_ct_reporter_unittest.cc

Index: chrome/browser/ssl/chrome_expect_ct_reporter_unittest.cc
diff --git a/chrome/browser/ssl/chrome_expect_ct_reporter_unittest.cc b/chrome/browser/ssl/chrome_expect_ct_reporter_unittest.cc
index a5bdeb3867fb9fa68b4176d3841fd5e801fc64e3..e173f18e31164b198fbffc58b9a652dbb22cbbad 100644
--- a/chrome/browser/ssl/chrome_expect_ct_reporter_unittest.cc
+++ b/chrome/browser/ssl/chrome_expect_ct_reporter_unittest.cc
@@ -44,6 +44,8 @@ class TestCertificateReportSender : public net::ReportSender {
     latest_serialized_report_ = serialized_report;
   }
 
+  void SetContentTypeHeader(const std::string& content_type) override {}
+
   const GURL& latest_report_uri() { return latest_report_uri_; }
 
   const std::string& latest_serialized_report() {