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..f52b7f81c26380e017508e34c6d3eb41ffc56ed9 100644
--- a/net/url_request/report_sender.cc
+++ b/net/url_request/report_sender.cc
@@ -45,6 +45,11 @@ void ReportSender::Send(const GURL& report_uri, const std::string& report) {
 
   url_request->set_method("POST");
 
+  if (!content_type_.empty()) {
+    url_request->SetExtraRequestHeaderByName(HttpRequestHeaders::kContentType,
+                                             content_type_, true);
+  }
+
   std::unique_ptr<UploadElementReader> reader(
       UploadOwnedBytesElementReader::CreateWithString(report));
   url_request->set_upload(
@@ -55,6 +60,10 @@ void ReportSender::Send(const GURL& report_uri, const std::string& report) {
   raw_url_request->Start();
 }
 
+void ReportSender::SetContentTypeHeader(const std::string& content_type) {
+  content_type_ = content_type;
+}
+
 void ReportSender::SetErrorCallback(const ErrorCallback& error_callback) {
   error_callback_ = error_callback;
 }