MIME type predicates and case-insensitive matching.

Source/core/inspector/InspectorPageAgent.cpp

Index: Source/core/inspector/InspectorPageAgent.cpp
diff --git a/Source/core/inspector/InspectorPageAgent.cpp b/Source/core/inspector/InspectorPageAgent.cpp
index 9193e4b971144ffc460bfc2703937fa03b0e99d7..07394e30878b8a10156392627e043d73e9dc69f7 100644
--- a/Source/core/inspector/InspectorPageAgent.cpp
+++ b/Source/core/inspector/InspectorPageAgent.cpp
@@ -166,7 +166,7 @@ static PassOwnPtr<TextResourceDecoder> createXHRTextDecoder(const String& mimeTy
 {
     if (!textEncodingName.isEmpty())
         return TextResourceDecoder::create("text/plain", textEncodingName);
-    if (DOMImplementation::isXMLMIMEType(mimeType.lower())) {
+    if (DOMImplementation::isXMLMIMEType(mimeType)) {
         OwnPtr<TextResourceDecoder> decoder = TextResourceDecoder::create("application/xml");
         decoder->useLenientXMLDecoding();
         return decoder.release();