Add Content-Type header to net::ReportSender reports

components/certificate_reporting/error_reporter.cc

Index: components/certificate_reporting/error_reporter.cc
diff --git a/components/certificate_reporting/error_reporter.cc b/components/certificate_reporting/error_reporter.cc
index 6015dcf0e68458bad0278e4fbf105eecf1762f0a..8b374136841955a494c9a873cae2757543594e18 100644
--- a/components/certificate_reporting/error_reporter.cc
+++ b/components/certificate_reporting/error_reporter.cc
@@ -138,7 +138,8 @@ ErrorReporter::~ErrorReporter() {}
 void ErrorReporter::SendExtendedReportingReport(
     const std::string& serialized_report) {
   if (upload_url_.SchemeIsCryptographic()) {
-    certificate_report_sender_->Send(upload_url_, serialized_report);
+    certificate_report_sender_->Send(upload_url_, "application/octet-stream",
+                                     serialized_report);
   } else {
     EncryptedCertLoggerRequest encrypted_report;
     if (!EncryptSerializedReport(server_public_key_, server_public_key_version_,
@@ -148,7 +149,8 @@ void ErrorReporter::SendExtendedReportingReport(
     }
     std::string serialized_encrypted_report;
     encrypted_report.SerializeToString(&serialized_encrypted_report);
-    certificate_report_sender_->Send(upload_url_, serialized_encrypted_report);
+    certificate_report_sender_->Send(upload_url_, "application/octet-stream",
+                                     serialized_encrypted_report);
   }
 }