Revert of Use the desktop GL core profile on Linux when ES3 support is requested.

ui/gl/gl_context_glx.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.
 
 extern "C" {
 #include <X11/Xlib.h>
 }
 
 #include "ui/gl/gl_context_glx.h"
 
@@ skipping 20 matching lines @@
 bool GLContextGLX::Initialize(
     GLSurface* compatible_surface, GpuPreference gpu_preference) {
   display_ = static_cast<XDisplay*>(compatible_surface->GetDisplay());
 
   GLXContext share_handle = static_cast<GLXContext>(
       share_group() ? share_group()->GetHandle() : NULL);
 
   if (GLSurfaceGLX::IsCreateContextSupported()) {
     DVLOG(1) << "GLX_ARB_create_context supported.";
     std::vector<int> attribs;
-    if (gfx::GetGLImplementation() ==
-        gfx::kGLImplementationDesktopGLCoreProfile) {
-      // TODO(kbr): NVIDIA's driver doesn't return a later context
-      // version if any version later than 3.1 is requested. We
-      // explicitly want to request a 3.2+ context with no support for
-      // the compatibility profile. WebGL 2.0 support currently
-      // requires a 4.2 context. crbug.com/473427
-      attribs.push_back(GLX_CONTEXT_MAJOR_VERSION_ARB);
-      attribs.push_back(4);
-      attribs.push_back(GLX_CONTEXT_MINOR_VERSION_ARB);
-      attribs.push_back(2);
-    }
     if (GLSurfaceGLX::IsCreateContextRobustnessSupported()) {
       DVLOG(1) << "GLX_ARB_create_context_robustness supported.";
       attribs.push_back(GLX_CONTEXT_RESET_NOTIFICATION_STRATEGY_ARB);
       attribs.push_back(GLX_LOSE_CONTEXT_ON_RESET_ARB);
     }
     attribs.push_back(0);
     context_ = glXCreateContextAttribsARB(
         display_,
         static_cast<GLXFBConfig>(compatible_surface->GetConfig()),
         share_handle,
@@ skipping 155 matching lines @@
 
 bool GLContextGLX::WasAllocatedUsingRobustnessExtension() {
   return GLSurfaceGLX::IsCreateContextRobustnessSupported();
 }
 
 GLContextGLX::~GLContextGLX() {
   Destroy();
 }
 
 }  // namespace gfx