Gtk3: Fix GtkTextView colors

chrome/browser/ui/libgtkui/gtk_util.h

Index: chrome/browser/ui/libgtkui/gtk_util.h
diff --git a/chrome/browser/ui/libgtkui/gtk_util.h b/chrome/browser/ui/libgtkui/gtk_util.h
index 322974a49d5df134337342c06e78266aa122722b..c87f70e0add005d326f9ea3fec28363cc500ecd5 100644
--- a/chrome/browser/ui/libgtkui/gtk_util.h
+++ b/chrome/browser/ui/libgtkui/gtk_util.h
@@ -217,8 +217,9 @@ SkColor GetBgColor(const char* css_selector);
 // 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);