Configure font font names in GFX unittests

ui/gfx/font_names_testing.h

Index: ui/gfx/font_names_testing.h
diff --git a/components/spellcheck/common/spellcheck_message_generator.h b/ui/gfx/font_names_testing.h
similarity index 53%
copy from components/spellcheck/common/spellcheck_message_generator.h
copy to ui/gfx/font_names_testing.h
index 0876034c524de64af94517fbb0eec76d791d33fb..a3c3a5430fdebd20b9c1886a108f3fe8a81de6c5 100644
--- a/components/spellcheck/common/spellcheck_message_generator.h
+++ b/ui/gfx/font_names_testing.h
@@ -2,8 +2,13 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Multiply-included file, hence no include guard.
+#ifndef UI_GFX_FONT_NAMES_TESTING_H_
+#define UI_GFX_FONT_NAMES_TESTING_H_
+
+namespace gfx {
+
+extern const char kSymbolFontName[];
+
+} // end namespace gfx
 
-#if defined(ENABLE_SPELLCHECK)
-#include "components/spellcheck/common/spellcheck_messages.h"
 #endif