Delete the font loading experiment code

content/child/dwrite_font_proxy/dwrite_font_proxy_win.h

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_CHILD_DWRITE_FONT_PROXY_DWRITE_FONT_PROXY_WIN_H_
 #define CONTENT_CHILD_DWRITE_FONT_PROXY_DWRITE_FONT_PROXY_WIN_H_
 
 #include <dwrite.h>
 #include <wrl.h>
 
@@ skipping 162 matching lines @@
   std::vector<Microsoft::WRL::ComPtr<IDWriteFontFileStream>> file_streams_;
   UINT32 next_file_ = 0;
   UINT32 current_file_ = UINT_MAX;
 
   DISALLOW_ASSIGN(FontFileEnumerator);
 };
 
 // Implements the DirectWrite font file stream interface that maps the file to
 // be loaded as a memory mapped file, and subsequently returns pointers into
 // the mapped memory block.
-// TODO(kulshin): confirm that using custom streams is actually an improvement
 class CONTENT_EXPORT FontFileStream
     : public Microsoft::WRL::RuntimeClass<
           Microsoft::WRL::RuntimeClassFlags<Microsoft::WRL::ClassicCom>,
           IDWriteFontFileStream> {
  public:
   FontFileStream();
   ~FontFileStream() override;
 
   // IDWriteFontFileStream:
   HRESULT STDMETHODCALLTYPE GetFileSize(UINT64* file_size) override;
   HRESULT STDMETHODCALLTYPE GetLastWriteTime(UINT64* last_write_time) override;
   HRESULT STDMETHODCALLTYPE ReadFileFragment(const void** fragment_start,
                                              UINT64 file_offset,
                                              UINT64 fragment_size,
                                              void** fragment_context) override;
   void STDMETHODCALLTYPE ReleaseFileFragment(void* fragment_context) override {}
 
   HRESULT STDMETHODCALLTYPE
   RuntimeClassInitialize(const base::string16& file_name);
 
  private:
   base::MemoryMappedFile data_;
 
   DISALLOW_ASSIGN(FontFileStream);
 };
 
 }  // namespace content
 #endif  // CONTENT_CHILD_DWRITE_FONT_PROXY_DWRITE_FONT_PROXY_WIN_H_