Gtk3: Remove box-shadow when rendering background colors

chrome/browser/ui/libgtkui/gtk_util.cc

 // 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.
 
 #include "chrome/browser/ui/libgtkui/gtk_util.h"
 
 #include <dlfcn.h>
 #include <gdk/gdk.h>
 #include <gdk/gdkx.h>
 #include <gtk/gtk.h>
@@ skipping 354 matching lines @@
   }
 }
 
 void RemoveBorders(GtkStyleContext* context) {
   static GtkCssProvider* provider = GetCssProvider(
       "* {"
       "border-style: none;"
       "border-radius: 0px;"
       "border-width: 0px;"
       "border-image-width: 0px;"
+      "box-shadow: none;"
       "padding: 0px;"
       "margin: 0px;"
+      "outline: none;"
+      "outline-width: 0px;"
       "}");
   ApplyCssToContext(context, provider);
 }
 
 void AddBorders(GtkStyleContext* context) {
   static GtkCssProvider* provider = GetCssProvider(
       "* {"
       "border-style: solid;"
       "border-radius: 0px;"
       "border-width: 1px;"
+      "box-shadow: none;"
       "padding: 0px;"
       "margin: 0px;"
+      "outline: none;"
+      "outline-width: 0px;"
       "}");
   ApplyCssToContext(context, provider);
 }
 
 // A 1x1 cairo surface that GTK can render into.
 class PixelSurface {
  public:
   PixelSurface()
       : surface_(cairo_image_surface_create(CAIRO_FORMAT_ARGB32, 1, 1)),
         cairo_(cairo_create(surface_)) {}
@@ skipping 55 matching lines @@
 
   AddBorders(context);
   PixelSurface surface;
   RenderBackground(surface.cairo(), context);
   gtk_render_frame(context, surface.cairo(), 0, 0, 1, 1);
   return surface.GetPixelValue();
 }
 #endif
 
 }  // namespace libgtkui