Gtk3: Fix border colors on Gtk3.20

chrome/browser/ui/libgtkui/gtk_util.cc

Index: chrome/browser/ui/libgtkui/gtk_util.cc
diff --git a/chrome/browser/ui/libgtkui/gtk_util.cc b/chrome/browser/ui/libgtkui/gtk_util.cc
index d8c09f13dc49bf8476d15d59843566605df16ccc..c6ef9db93efd3148de7d9b7218b15d9ac3264a0a 100644
--- a/chrome/browser/ui/libgtkui/gtk_util.cc
+++ b/chrome/browser/ui/libgtkui/gtk_util.cc
@@ -513,7 +513,7 @@ SkColor GetBorderColor(const char* css_selector) {
   gfx::Size size = GetMinimumWidgetSize(context);
   CairoSurface surface(size);
   RenderBackground(size, surface.cairo(), context);
-  gtk_render_frame(context, surface.cairo(), 0, 0, 1, 1);
+  gtk_render_frame(context, surface.cairo(), 0, 0, size.width(), size.height());
   return surface.GetAveragePixelValue(true);
 }