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..f3cdea96399ce36addf5a89d83cd5b5e6423b92e 100644
--- a/chrome/browser/ssl/chrome_expect_ct_reporter_unittest.cc
+++ b/chrome/browser/ssl/chrome_expect_ct_reporter_unittest.cc
@@ -39,19 +39,24 @@ class TestCertificateReportSender : public net::ReportSender {
   ~TestCertificateReportSender() override {}
 
   void Send(const GURL& report_uri,
+            const std::string& content_type,
             const std::string& serialized_report) override {
     latest_report_uri_ = report_uri;
+    latest_content_type_ = content_type,
     latest_serialized_report_ = serialized_report;
   }
 
   const GURL& latest_report_uri() { return latest_report_uri_; }
 
+  const std::string& latest_content_type() { return latest_content_type_; }
+
   const std::string& latest_serialized_report() {
     return latest_serialized_report_;
   }
 
  private:
   GURL latest_report_uri_;
+  std::string latest_content_type_;
   std::string latest_serialized_report_;
 };
 
@@ -478,6 +483,7 @@ TEST(ChromeExpectCTReporterTest, SendReport) {
   reporter.OnExpectCTFailed(host_port, report_uri, ssl_info);
   EXPECT_EQ(report_uri, sender->latest_report_uri());
   EXPECT_FALSE(sender->latest_serialized_report().empty());
+  EXPECT_EQ("application/json", sender->latest_content_type());
   ASSERT_NO_FATAL_FAILURE(CheckExpectCTReport(
       sender->latest_serialized_report(), host_port, ssl_info));