Remove unused fields from WebGraphicsContext3D::Attributes.

content/common/gpu/client/webgraphicscontext3d_command_buffer_impl.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 "content/common/gpu/client/webgraphicscontext3d_command_buffer_impl.h"
 
 #include "third_party/khronos/GLES2/gl2.h"
 #ifndef GL_GLEXT_PROTOTYPES
 #define GL_GLEXT_PROTOTYPES 1
 #endif
@@ skipping 80 matching lines @@
     : lose_context_when_out_of_memory_(lose_context_when_out_of_memory),
       attributes_(attributes),
       host_(host),
       surface_handle_(surface_handle),
       active_url_(active_url),
       context_type_(CONTEXT_TYPE_UNKNOWN),
       gpu_preference_(attributes.preferDiscreteGPU ? gfx::PreferDiscreteGpu
                                                    : gfx::PreferIntegratedGpu),
       mem_limits_(limits),
       weak_ptr_factory_(this) {
-  if (attributes_.webGL)
+  if (attributes_.webGLVersion > 0)
     context_type_ = OFFSCREEN_CONTEXT_FOR_WEBGL;
   if (share_context) {
     DCHECK(!attributes_.shareResources);
     share_group_ = share_context->share_group_;
   } else {
     share_group_ = attributes_.shareResources
         ? GetDefaultShareGroupForHost(host)
         : scoped_refptr<WebGraphicsContext3DCommandBufferImpl::ShareGroup>(
             new ShareGroup());
   }
@@ skipping 242 matching lines @@
   {
     base::AutoLock lock(g_default_share_groups_lock.Get());
     g_default_share_groups.Get().erase(host_.get());
   }
 
   gpu::CommandBuffer::State state = command_buffer_->GetLastState();
   UmaRecordContextLost(context_type_, state.error, state.context_lost_reason);
 }
 
 }  // namespace content