Add Content-Type header to net::ReportSender reports

net/http/transport_security_state_unittest.cc

Index: net/http/transport_security_state_unittest.cc
diff --git a/net/http/transport_security_state_unittest.cc b/net/http/transport_security_state_unittest.cc
index 2026aa5b7038c673a03a27655ad2f825f5bb134b..18cfeafee105af5d4233c6b974fe30f0a14f3530 100644
--- a/net/http/transport_security_state_unittest.cc
+++ b/net/http/transport_security_state_unittest.cc
@@ -95,6 +95,10 @@ class MockCertificateReportSender
     latest_report_ = report;
   }
 
+  void SetContentTypeHeader(const std::string& content_type) override {
+    latest_content_type_ = content_type;
+  }
+
   void SetErrorCallback(
       const base::Callback<void(const GURL&, int)>& error_callback) override {}
 
@@ -105,10 +109,12 @@ class MockCertificateReportSender
 
   const GURL& latest_report_uri() { return latest_report_uri_; }
   const std::string& latest_report() { return latest_report_; }
+  const std::string& latest_content_type() { return latest_content_type_; }
 
  private:
   GURL latest_report_uri_;
   std::string latest_report_;
+  std::string latest_content_type_;
 };
 
 // A mock ReportSenderInterface that simulates a net error on every report sent.
@@ -126,6 +132,8 @@ class MockFailingCertificateReportSender
     error_callback_.Run(report_uri, net_error_);
   }
 
+  void SetContentTypeHeader(const std::string& content_type) override {}
+
   void SetErrorCallback(
       const base::Callback<void(const GURL&, int)>& error_callback) override {
     error_callback_ = error_callback;
@@ -333,6 +341,7 @@ void CheckExpectStapleReport(TransportSecurityState* state,
                              const std::string& ocsp_response,
                              const std::string& response_status,
                              const std::string& cert_status) {
+  EXPECT_EQ("application/json", reporter->latest_content_type());
   // Expect-Staple is preload list based, so we use the baked-in test hostname
   // from the list ("preloaded-expect-staple.badssl.com").
   HostPortPair host_port(kExpectStapleStaticHostname, 443);
@@ -1442,6 +1451,7 @@ TEST_F(TransportSecurityStateTest, HPKPReporting) {
   // Now a report should have been sent. Check that it contains the
   // right information.
   EXPECT_EQ(report_uri, mock_report_sender.latest_report_uri());
+  EXPECT_EQ("application/json", mock_report_sender.latest_content_type());
   std::string report = mock_report_sender.latest_report();
   ASSERT_FALSE(report.empty());
   ASSERT_NO_FATAL_FAILURE(CheckHPKPReport(report, host_port_pair, true, kHost,
@@ -1457,6 +1467,7 @@ TEST_F(TransportSecurityStateTest, HPKPReporting) {
   // Now a report should have been sent for the subdomain. Check that it
   // contains the right information.
   EXPECT_EQ(report_uri, mock_report_sender.latest_report_uri());
+  EXPECT_EQ("application/json", mock_report_sender.latest_content_type());
   report = mock_report_sender.latest_report();
   ASSERT_FALSE(report.empty());
   ASSERT_NO_FATAL_FAILURE(CheckHPKPReport(report, subdomain_host_port_pair,