Add Content-Type header to net::ReportSender reports

net/url_request/report_sender.cc

Index: net/url_request/report_sender.cc
diff --git a/net/url_request/report_sender.cc b/net/url_request/report_sender.cc
index 76f171d116a7e68fd19911b0edeace9d99f3ff5a..e98dae394fefbf512e7109d3aca5549202b74d72 100644
--- a/net/url_request/report_sender.cc
+++ b/net/url_request/report_sender.cc
@@ -32,7 +32,9 @@ ReportSender::~ReportSender() {
   base::STLDeleteElements(&inflight_requests_);
 }
 
-void ReportSender::Send(const GURL& report_uri, const std::string& report) {
+void ReportSender::Send(const GURL& report_uri,
+                        const std::string& content_type,
+                        const std::string& report) {
   std::unique_ptr<URLRequest> url_request =
       request_context_->CreateRequest(report_uri, DEFAULT_PRIORITY, this);
 
@@ -43,6 +45,9 @@ void ReportSender::Send(const GURL& report_uri, const std::string& report) {
   }
   url_request->SetLoadFlags(load_flags);
 
+  url_request->SetExtraRequestHeaderByName(HttpRequestHeaders::kContentType,
+                                           content_type, true);
+
   url_request->set_method("POST");
 
   std::unique_ptr<UploadElementReader> reader(