Add Content-Type header to net::ReportSender reports

chrome/browser/ssl/chrome_expect_ct_reporter_unittest.cc

 // 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.
 
 #include "chrome/browser/ssl/chrome_expect_ct_reporter.h"
 
 #include <string>
 
 #include "base/base64.h"
 #include "base/command_line.h"
@@ skipping 26 matching lines @@
   TestCertificateReportSender()
       : ReportSender(nullptr, net::ReportSender::DO_NOT_SEND_COOKIES) {}
   ~TestCertificateReportSender() override {}
 
   void Send(const GURL& report_uri,
             const std::string& serialized_report) override {
     latest_report_uri_ = report_uri;
     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() {
     return latest_serialized_report_;
   }
 
  private:
   GURL latest_report_uri_;
   std::string latest_serialized_report_;
 };
@@ skipping 421 matching lines @@
   reporter.OnExpectCTFailed(host_port, report_uri, ssl_info);
   EXPECT_EQ(report_uri, sender->latest_report_uri());
   EXPECT_FALSE(sender->latest_serialized_report().empty());
   ASSERT_NO_FATAL_FAILURE(CheckExpectCTReport(
       sender->latest_serialized_report(), host_port, ssl_info));
 
   histograms.ExpectTotalCount(kFailureHistogramName, 0);
   histograms.ExpectTotalCount(kSendHistogramName, 1);
   histograms.ExpectBucketCount(kSendHistogramName, true, 1);
 }