Consider "mixed content XHR" as mixed script instead of mixed display.

Source/core/xml/XMLHttpRequest.cpp

Index: Source/core/xml/XMLHttpRequest.cpp
diff --git a/Source/core/xml/XMLHttpRequest.cpp b/Source/core/xml/XMLHttpRequest.cpp
index ced9f078707ad8d5b350cce6c2c61cc896150ef5..1b5f3775337c8c6184ad67bed4a46a1b1ce057de 100644
--- a/Source/core/xml/XMLHttpRequest.cpp
+++ b/Source/core/xml/XMLHttpRequest.cpp
@@ -750,6 +750,7 @@ void XMLHttpRequest::createRequest(ExceptionState& es)
     options.securityOrigin = securityOrigin();
     options.initiator = FetchInitiatorTypeNames::xmlhttprequest;
     options.contentSecurityPolicyEnforcement = ContentSecurityPolicy::shouldBypassMainWorld(scriptExecutionContext()) ? DoNotEnforceContentSecurityPolicy : EnforceConnectSrcDirective;
+    options.mixedRawContentBlockingOption = TreatAsActiveContent;
     options.timeoutMilliseconds = m_timeoutMilliseconds;
 
     m_exceptionCode = 0;