Configure font font names in GFX unittests

ui/gfx/font_names_testing.h

Index: ui/gfx/font_names_testing.h
diff --git a/ui/gfx/image/image_skia_source.cc b/ui/gfx/font_names_testing.h
similarity index 50%
copy from ui/gfx/image/image_skia_source.cc
copy to ui/gfx/font_names_testing.h
index 53bc4271ca78ecbb384aa42f73e81bcf8e11decf..34c96bef6adfed09e4cffcb5a2fbba3d785fb82c 100644
--- a/ui/gfx/image/image_skia_source.cc
+++ b/ui/gfx/font_names_testing.h
@@ -2,12 +2,14 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "ui/gfx/image/image_skia_source.h"
+#ifndef UI_GFX_FONT_NAMES_TESTING_H_
+#define UI_GFX_FONT_NAMES_TESTING_H_
 
 namespace gfx {
 
-ImageSkiaSource::~ImageSkiaSource() {}
+extern const char kSymbolFontName[];
+extern const char kCJKFontName[];
 
-bool ImageSkiaSource::HasRepresentationAtAllScales() const { return false; }
+} // end namespace gfx
 
-}  // namespace gfx
+#endif