Eliminate [LegacyInterfaceTypeChecking] for modules/filesystem bindings

third_party/WebKit/Source/modules/filesystem/FileWriter.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 77 matching lines @@
     m_readyState = DONE;
 }
 
 bool FileWriter::hasPendingActivity() const
 {
     return m_operationInProgress != OperationNone || m_queuedOperation != OperationNone || m_readyState == WRITING;
 }
 
 void FileWriter::write(Blob* data, ExceptionState& exceptionState)
 {
+    ASSERT(data);
     ASSERT(writer());
     ASSERT(m_truncateLength == -1);
     if (m_readyState == WRITING) {
         setError(FileError::INVALID_STATE_ERR, exceptionState);
         return;
     }
-    if (!data) {
-        setError(FileError::TYPE_MISMATCH_ERR, exceptionState);
-        return;
-    }
     if (m_recursionDepth > kMaxRecursionDepth) {
         setError(FileError::SECURITY_ERR, exceptionState);
         return;
     }
 
     m_blobBeingWritten = data;
     m_readyState = WRITING;
     m_bytesWritten = 0;
     m_bytesToWrite = data->size();
     ASSERT(m_queuedOperation == OperationNone);
@@ skipping 208 matching lines @@
 DEFINE_TRACE(FileWriter)
 {
     visitor->trace(m_error);
     visitor->trace(m_blobBeingWritten);
     EventTargetWithInlineData::trace(visitor);
     FileWriterBase::trace(visitor);
     ActiveDOMObject::trace(visitor);
 }
 
 } // namespace blink