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

ui/gl/gl_surface_egl.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 "ui/gl/gl_surface_egl.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <map>
@@ skipping 213 matching lines @@
   if (*num_configs == 0) {
     return false;
   }
   return true;
 }
 
 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;
 
 #if defined(USE_X11) && !defined(OS_CHROMEOS)
   ui::XVisualManager::GetInstance()->ChooseVisualForWindow(
       true, nullptr, &buffer_size, nullptr, nullptr);
   alpha_size = buffer_size == 32 ? 8 : 0;
 #endif
 
@@ skipping 951 matching lines @@
 }
 
 void* SurfacelessEGL::GetShareHandle() {
   return NULL;
 }
 
 SurfacelessEGL::~SurfacelessEGL() {
 }
 
 }  // namespace gl