Remove unsafe mode to enable es3 api by default for WebGL2 and ES3 context

ui/gl/gl_surface_egl.cc

Index: ui/gl/gl_surface_egl.cc
diff --git a/ui/gl/gl_surface_egl.cc b/ui/gl/gl_surface_egl.cc
index 1b82c97888c590d26f12d6cc28d7b792a5aa5cea..cb7a6df9693c5bfd47654544ee22449e39ced117 100644
--- a/ui/gl/gl_surface_egl.cc
+++ b/ui/gl/gl_surface_egl.cc
@@ -231,11 +231,8 @@ EGLConfig ChooseConfig(GLSurface::Format format) {
   // Choose an EGL configuration.
   // On X this is only used for PBuffer surfaces.
   std::vector<EGLint> renderable_types;
-  if (base::CommandLine::ForCurrentProcess()->HasSwitch(
-          switches::kEnableUnsafeES3APIs)) {
-    renderable_types.push_back(EGL_OPENGL_ES3_BIT);
-  }
   renderable_types.push_back(EGL_OPENGL_ES2_BIT);
+  renderable_types.push_back(EGL_OPENGL_ES3_BIT);
 
   EGLint buffer_size = 32;
   EGLint alpha_size = 8;