Change XSS Auditor report's MIME type.

third_party/WebKit/Source/core/loader/PingLoader.cpp

Index: third_party/WebKit/Source/core/loader/PingLoader.cpp
diff --git a/third_party/WebKit/Source/core/loader/PingLoader.cpp b/third_party/WebKit/Source/core/loader/PingLoader.cpp
index 6afde83f2368e9eb360675f1a959aa8838089739..e02b49bb2f4ea36d7af47d17bf9217a32685a05c 100644
--- a/third_party/WebKit/Source/core/loader/PingLoader.cpp
+++ b/third_party/WebKit/Source/core/loader/PingLoader.cpp
@@ -523,9 +523,14 @@ void PingLoader::sendViolationReport(LocalFrame* frame,
                                      ViolationReportType type) {
   ResourceRequest request(reportURL);
   request.setHTTPMethod(HTTPNames::POST);
-  request.setHTTPContentType(type == ContentSecurityPolicyViolationReport
-                                 ? "application/csp-report"
-                                 : "application/json");
+  switch (type) {
+    case ContentSecurityPolicyViolationReport:
+      request.setHTTPContentType("application/csp-report");
+      break;
+    case XSSAuditorViolationReport:
+      request.setHTTPContentType("application/xss-auditor-report");
+      break;
+  }
   request.setHTTPBody(std::move(report));
   finishPingRequestInitialization(request, frame,
                                   WebURLRequest::RequestContextCSPReport);