Archive loading should be case insensitive to mimetype "multipart/related"

Source/core/loader/DocumentLoader.cpp

 /*
  * Copyright (C) 2006, 2007, 2008 Apple Inc. All rights reserved.
  * Copyright (C) 2011 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
@@ skipping 55 matching lines @@
 #include "platform/weborigin/SecurityPolicy.h"
 #include "public/platform/Platform.h"
 #include "public/platform/WebMimeRegistry.h"
 #include "wtf/Assertions.h"
 #include "wtf/text/WTFString.h"
 
 namespace blink {
 
 static bool isArchiveMIMEType(const String& mimeType)
 {
-    return mimeType == "multipart/related";
+    return equalIgnoringCase("multipart/related", mimeType);
 }
 
 DocumentLoader::DocumentLoader(LocalFrame* frame, const ResourceRequest& req, const SubstituteData& substituteData)
     : m_frame(frame)
     , m_fetcher(FrameFetchContext::createContextAndFetcher(this))
     , m_originalRequest(req)
     , m_substituteData(substituteData)
     , m_request(req)
     , m_committed(false)
     , m_isClientRedirect(false)
@@ skipping 291 matching lines @@
         // The server wants us to download instead of replacing the page contents.
         // Downloading is handled by the embedder, but we still get the initial
         // response so that we can ignore it and clean up properly.
         return false;
     }
 
     if (!canShowMIMEType(m_response.mimeType(), m_frame->page()))
         return false;
 
     // Prevent remote web archives from loading because they can claim to be from any domain and thus avoid cross-domain security checks.
-    if (equalIgnoringCase("multipart/related", m_response.mimeType()) && !SchemeRegistry::shouldTreatURLSchemeAsLocal(m_request.url().protocol()))
+    if (isArchiveMIMEType(m_response.mimeType()) && !SchemeRegistry::shouldTreatURLSchemeAsLocal(m_request.url().protocol()))
         return false;
 
     return true;
 }
 
 void DocumentLoader::cancelLoadAfterXFrameOptionsOrCSPDenied(const ResourceResponse& response)
 {
     InspectorInstrumentation::continueAfterXFrameOptionsDenied(m_frame, this, mainResourceIdentifier(), response);
 
     frame()->document()->enforceSandboxFlags(SandboxOrigin);
@@ skipping 384 matching lines @@
 // This is only called by FrameLoader::replaceDocumentWhileExecutingJavaScriptURL()
 void DocumentLoader::replaceDocumentWhileExecutingJavaScriptURL(const DocumentInit& init, const String& source, Document* ownerDocument)
 {
     m_writer = createWriterFor(ownerDocument, init, mimeType(), m_writer ? m_writer->encoding() : emptyAtom, true, ForceSynchronousParsing);
     if (!source.isNull())
         m_writer->appendReplacingData(source);
     endWriting(m_writer.get());
 }
 
 } // namespace blink