X11: Use better visuals for OpenGL

ui/gfx/x/x11_switches.cc

Index: ui/gfx/x/x11_switches.cc
diff --git a/ui/gfx/x/x11_switches.cc b/ui/gfx/x/x11_switches.cc
index 931bfb9c7ad142f10df5d9872c5341eca7f17db1..1c1fa72deeba58034d9a8adbce3e50cd62fe0261 100644
--- a/ui/gfx/x/x11_switches.cc
+++ b/ui/gfx/x/x11_switches.cc
@@ -8,16 +8,9 @@
 namespace switches {
 
 #if !defined(OS_CHROMEOS)
-// Color bit depth of the main window created in the browser process and matches
-// XWindowAttributes.depth.
-const char kWindowDepth[] = "window-depth";
-
 // Which X11 display to connect to. Emulates the GTK+ "--display=" command line
 // argument.
 const char kX11Display[] = "display";
-
-// A VisualID that supports the requested window depth.
-const char kX11VisualID[] = "x11-visual-id";
 #endif
 
 }  // namespace switches