MediaPlayer cleanup, part one of N

Source/core/platform/chromium/MIMETypeRegistryChromium.cpp

Index: Source/core/platform/chromium/MIMETypeRegistryChromium.cpp
diff --git a/Source/core/platform/chromium/MIMETypeRegistryChromium.cpp b/Source/core/platform/chromium/MIMETypeRegistryChromium.cpp
index 20fd6db81836d80c1c812c4d725250616fd1c30d..709218fa244b5fb24590da074b6d49201d8f4491 100644
--- a/Source/core/platform/chromium/MIMETypeRegistryChromium.cpp
+++ b/Source/core/platform/chromium/MIMETypeRegistryChromium.cpp
@@ -119,13 +119,6 @@ bool MIMETypeRegistry::isSupportedNonImageMIMEType(const String& mimeType)
         != WebKit::WebMimeRegistry::IsNotSupported;
 }
 
-bool MIMETypeRegistry::isSupportedMediaMIMEType(const String& mimeType)
-{
-    HashSet<String> supportedMediaMIMETypes;
-    MediaPlayer::getSupportedTypes(supportedMediaMIMETypes);
-    return !mimeType.isEmpty() && supportedMediaMIMETypes.contains(mimeType);
-}
-
 bool MIMETypeRegistry::isSupportedMediaSourceMIMEType(const String& mimeType, const String& codecs)
 {
     return !mimeType.isEmpty() && !codecs.isEmpty()