Implement support for loading font files from outside system directory

content/child/dwrite_font_proxy/dwrite_font_proxy_win.h

Index: content/child/dwrite_font_proxy/dwrite_font_proxy_win.h
diff --git a/content/child/dwrite_font_proxy/dwrite_font_proxy_win.h b/content/child/dwrite_font_proxy/dwrite_font_proxy_win.h
index 555876026d1c4c8d7b2046ec25de7bea7772743d..d6115cdab6e430c31ae085e68d61c906cfd22030 100644
--- a/content/child/dwrite_font_proxy/dwrite_font_proxy_win.h
+++ b/content/child/dwrite_font_proxy/dwrite_font_proxy_win.h
@@ -164,13 +164,12 @@ class CONTENT_EXPORT FontFileEnumerator
   HRESULT STDMETHODCALLTYPE
   RuntimeClassInitialize(IDWriteFactory* factory,
                          IDWriteFontFileLoader* loader,
-                         std::vector<base::string16>* file_names);
+                         std::vector<HANDLE>* files);
 
  private:
   Microsoft::WRL::ComPtr<IDWriteFactory> factory_;
   Microsoft::WRL::ComPtr<IDWriteFontFileLoader> loader_;
-  std::vector<base::string16> file_names_;
-  std::vector<Microsoft::WRL::ComPtr<IDWriteFontFileStream>> file_streams_;
+  std::vector<HANDLE> files_;
   UINT32 next_file_ = 0;
   UINT32 current_file_ = UINT_MAX;
 
@@ -197,8 +196,7 @@ class CONTENT_EXPORT FontFileStream
                                              void** fragment_context) override;
   void STDMETHODCALLTYPE ReleaseFileFragment(void* fragment_context) override {}
 
-  HRESULT STDMETHODCALLTYPE
-  RuntimeClassInitialize(const base::string16& file_name);
+  HRESULT STDMETHODCALLTYPE RuntimeClassInitialize(HANDLE handle);
 
  private:
   base::MemoryMappedFile data_;