Gtk3: Fix tab border color and --secondary-ui-md colors

chrome/browser/ui/libgtkui/gtk_ui.h

Index: chrome/browser/ui/libgtkui/gtk_ui.h
diff --git a/chrome/browser/ui/libgtkui/gtk_ui.h b/chrome/browser/ui/libgtkui/gtk_ui.h
index a0662515933922c00a5ae7e3f32b038a4f292b40..f58d94313b0421a61bd798b74109b02276588b48 100644
--- a/chrome/browser/ui/libgtkui/gtk_ui.h
+++ b/chrome/browser/ui/libgtkui/gtk_ui.h
@@ -122,10 +122,6 @@ class GtkUi : public views::LinuxUI {
   // Sets the Xcursor theme and size with the GTK theme and size.
   void UpdateCursorTheme();
 
-  // Reads in explicit theme frame colors from the ChromeGtkFrame style class
-  // or generates them per our fallback algorithm.
-  void BuildFrameColors();
-
   // Updates |default_font_*|.
   void UpdateDefaultFont();