Blob/File constructors/slice method shouldn't throw on invalid types

Source/core/fileapi/Blob.cpp

 /*
  * Copyright (C) 2010 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 71 matching lines @@
 }
 
 Blob::~Blob()
 {
 }
 
 // static
 Blob* Blob::create(const HeapVector<ArrayBufferOrArrayBufferViewOrBlobOrString>& blobParts, const BlobPropertyBag& options, ExceptionState& exceptionState)
 {
     ASSERT(options.hasType());
-    if (!options.type().containsOnlyASCII()) {
-        exceptionState.throwDOMException(SyntaxError, "The 'type' property must consist of ASCII characters.");
-        return nullptr;
-    }
 
     ASSERT(options.hasEndings());
     bool normalizeLineEndingsToNative = options.endings() == "native";
 
     OwnPtr<BlobData> blobData = BlobData::create();
     blobData->setContentType(options.type().lower());
 
     populateBlobData(blobData.get(), blobParts, normalizeLineEndingsToNative);
 
     long long blobSize = blobData->length();
@@ skipping 29 matching lines @@
     if (hasBeenClosed()) {
         exceptionState.throwDOMException(InvalidStateError, "Blob has been closed.");
         return nullptr;
     }
 
     long long size = this->size();
     clampSliceOffsets(size, start, end);
 
     long long length = end - start;
     OwnPtr<BlobData> blobData = BlobData::create();
-    blobData->setContentType(contentType);
+    blobData->setContentType(contentType.lower());
     blobData->appendBlob(m_blobDataHandle, start, length);
     return Blob::create(BlobDataHandle::create(blobData.release(), length));
 }
 
 void Blob::close(ExecutionContext* executionContext, ExceptionState& exceptionState)
 {
     if (hasBeenClosed()) {
         exceptionState.throwDOMException(InvalidStateError, "Blob has been closed.");
         return;
     }
@@ skipping 17 matching lines @@
 {
     blobData.appendBlob(m_blobDataHandle, 0, m_blobDataHandle->size());
 }
 
 URLRegistry& Blob::registry() const
 {
     return BlobURLRegistry::registry();
 }
 
 } // namespace blink