experimental: remove old PDF benchmarking tools

experimental/tools/SkDmuxWStream.h

-/*
- * Copyright 2015 Google Inc.
- *
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- */
-#ifndef SkDmuxWStream_DEFINED
-#define SkDmuxWStream_DEFINED
-
-#include "SkStream.h"
-#include "SkTDArray.h"
-
-/**
- *  A SkWStream Demultiplexer.  If initialized with
- *      SkDmuxWStream dmuxWStream(NULL, 0);
- *  then it becomes a /dev/null.
- */
-class SkDmuxWStream : public SkWStream {
-public:
-    SkDmuxWStream(SkWStream* const streamArray[], size_t count);
-    ~SkDmuxWStream();
-    virtual bool write(const void* buffer, size_t size) override;
-    virtual void newline() override;
-    virtual void flush() override;
-    virtual size_t bytesWritten() const override;
-
-private:
-    SkTDArray<SkWStream*> fWStreams;
-    size_t fBytesWritten;
-};
-
-#endif  // SkDmuxWStream_DEFINED