Remove offscreen compositor contexts.

cc/output/gl_renderer.cc

 // Copyright 2010 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 "cc/output/gl_renderer.h"
 
 #include <algorithm>
 #include <limits>
 #include <set>
 #include <string>
@@ skipping 316 matching lines @@
   capabilities_.max_texture_size = resource_provider_->max_texture_size();
   capabilities_.best_texture_format = resource_provider_->best_texture_format();
 
   // The updater can access textures while the GLRenderer is using them.
   capabilities_.allow_partial_texture_updates = true;
 
   // Check for texture fast paths. Currently we always use MO8 textures,
   // so we only need to avoid POT textures if we have an NPOT fast-path.
   capabilities_.avoid_pow2_textures = context_caps.gpu.fast_npot_mo8_textures;
 
-  capabilities_.using_offscreen_context3d = false;
-
   capabilities_.using_map_image =
       settings_->use_map_image && context_caps.gpu.map_image;
 
   capabilities_.using_discard_framebuffer =
       context_caps.gpu.discard_framebuffer;
 
   capabilities_.allow_rasterize_on_demand = true;
 
   use_sync_query_ = context_caps.gpu.sync_query;
 
@@ skipping 2853 matching lines @@
     context_support_->ScheduleOverlayPlane(
         overlay.plane_z_order,
         overlay.transform,
         pending_overlay_resources_.back()->texture_id(),
         overlay.display_rect,
         overlay.uv_rect);
   }
 }
 
 }  // namespace cc