Move the ShouldUseDirectWrite function from sandbox_win.cc/.h to ui/gfx/win/dpi.cc/.h.

ui/gfx/switches.h

Index: ui/gfx/switches.h
diff --git a/ui/gfx/switches.h b/ui/gfx/switches.h
index 1fb28a196044b81452551c95ae6d7f78bd9cf5f2..77d7dd5af240c0f7d115d88d5a35592ef2ba8038 100644
--- a/ui/gfx/switches.h
+++ b/ui/gfx/switches.h
@@ -5,6 +5,7 @@
 #ifndef UI_GFX_SWITCHES_H_
 #define UI_GFX_SWITCHES_H_
 
+#include "build/build_config.h"
 #include "ui/gfx/gfx_export.h"
 
 namespace switches {
@@ -15,6 +16,10 @@ GFX_EXPORT extern const char kEnableHarfBuzzRenderText[];
 GFX_EXPORT extern const char kEnableWebkitTextSubpixelPositioning[];
 GFX_EXPORT extern const char kForceDeviceScaleFactor[];
 
+#if defined(OS_WIN)
+GFX_EXPORT extern const char kDisableDirectWrite[];
+#endif
+
 }  // namespace switches
 
 #endif  // UI_GFX_SWITCHES_H_