Gtk3: Fix GtkTextView colors

chrome/browser/ui/libgtkui/gtk_util.h

 // Copyright (c) 2012 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 CHROME_BROWSER_UI_LIBGTKUI_GTK_UTIL_H_
 #define CHROME_BROWSER_UI_LIBGTKUI_GTK_UTIL_H_
 
 #include <gtk/gtk.h>
 #include <string>
 
@@ skipping 199 matching lines @@
 // Renders a background from the style context created by
 // GetStyleContextFromCss(|css_selector|) into a 24x24 bitmap and
 // returns the average color.
 SkColor GetBgColor(const char* css_selector);
 
 // Renders the border from the style context created by
 // GetStyleContextFromCss(|css_selector|) into a 24x24 bitmap and
 // returns the average color.
 SkColor GetBorderColor(const char* css_selector);
 
-SkColor GetSelectedTextColor(const char* css_selector);
-SkColor GetSelectedBgColor(const char* css_selector);
+// On Gtk3.20 or later, behaves like GetBgColor.  Otherwise, returns
+// the background-color property.
+SkColor GetSelectionBgColor(const char* css_selector);
 
 // Get the color of the GtkSeparator specified by |css_selector|.
 SkColor GetSeparatorColor(const char* css_selector);
 #endif
 
 }  // namespace libgtkui
 
 #endif  // CHROME_BROWSER_UI_LIBGTKUI_GTK_UTIL_H_