Gtk3: Use menubar instead of headerbar on version less than 3.10

chrome/browser/ui/libgtkui/native_theme_gtk3.cc

 // Copyright 2016 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.
 
 #include "chrome/browser/ui/libgtkui/native_theme_gtk3.h"
 
 #include <gtk/gtk.h>
 
 #include "chrome/browser/ui/libgtkui/chrome_gtk_frame.h"
 #include "chrome/browser/ui/libgtkui/chrome_gtk_menu_subclasses.h"
@@ skipping 130 matching lines @@
         return GetFgColor("GtkLabel.link:link:hover:active");
     // fallthrough
     case ui::NativeTheme::kColorId_LinkEnabled: {
       if (GtkVersionCheck(3, 12)) {
         return GetFgColor("GtkLabel.link:link");
       }
       auto link_context = GetStyleContextFromCss("GtkLabel.view");
       GdkColor* color;
       gtk_style_context_get_style(link_context, "link-color", &color, nullptr);
       if (color) {
-        SkColor ret_color = SkColorSetRGB(color->red / 255, color->green / 255,
-                                          color->blue / 255);
+        SkColor ret_color = GdkColorToSkColor(*color);
         // gdk_color_free() was deprecated in Gtk3.14.  This code path is only
         // taken on versions earlier than Gtk3.12, but the compiler doesn't know
         // that, so silence the deprecation warnings.
         G_GNUC_BEGIN_IGNORE_DEPRECATIONS;
         gdk_color_free(color);
         G_GNUC_END_IGNORE_DEPRECATIONS;
         return ret_color;
       }
 
       // Default color comes from gtklinkbutton.c.
@@ skipping 404 matching lines @@
       canvas->drawLine(x, y, x + w, y, flags);
     }
   }
 }
 
 void NativeThemeGtk3::PaintFrameTopArea(
     cc::PaintCanvas* canvas,
     State state,
     const gfx::Rect& rect,
     const FrameTopAreaExtraParams& frame_top_area) const {
-  auto context = GetStyleContextFromCss(frame_top_area.use_custom_frame
+  auto context = GetStyleContextFromCss(frame_top_area.use_custom_frame &&
+                                                GtkVersionCheck(3, 10)
                                             ? "#headerbar.header-bar.titlebar"
                                             : "GtkMenuBar#menubar");
   ApplyCssToContext(context, "* { border-radius: 0px; border-style: none; }");
   gtk_style_context_set_state(context, frame_top_area.is_active
                                            ? GTK_STATE_FLAG_NORMAL
                                            : GTK_STATE_FLAG_BACKDROP);
 
   SkBitmap bitmap =
       GetWidgetBitmap(rect.size(), context, BG_RENDER_RECURSIVE, false);
 
   if (frame_top_area.incognito) {
     bitmap = SkBitmapOperations::CreateHSLShiftedBitmap(
         bitmap, kDefaultTintFrameIncognito);
   }
 
   canvas->drawBitmap(bitmap, rect.x(), rect.y());
 }
 
 }  // namespace libgtkui