Always set using_map_image when using software renderer.

cc/output/software_renderer.cc

 // Copyright 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 "cc/output/software_renderer.h"
 
 #include "base/debug/trace_event.h"
 #include "cc/base/math_util.h"
 #include "cc/output/compositor_frame.h"
 #include "cc/output/compositor_frame_ack.h"
@@ skipping 105 matching lines @@
       current_canvas_(NULL) {
   if (resource_provider_) {
     capabilities_.max_texture_size = resource_provider_->max_texture_size();
     capabilities_.best_texture_format =
         resource_provider_->best_texture_format();
   }
   // The updater can access bitmaps while the SoftwareRenderer is using them.
   capabilities_.allow_partial_texture_updates = true;
   capabilities_.using_partial_swap = true;
 
-  capabilities_.using_map_image = settings_->use_map_image;
+  capabilities_.using_map_image = true;
   capabilities_.using_shared_memory_resources = true;
 
   capabilities_.allow_rasterize_on_demand = true;
 }
 
 SoftwareRenderer::~SoftwareRenderer() {}
 
 const RendererCapabilitiesImpl& SoftwareRenderer::Capabilities() const {
   return capabilities_;
 }
@@ skipping 519 matching lines @@
     return;
   visible_ = visible;
 
   if (visible_)
     EnsureBackbuffer();
   else
     DiscardBackbuffer();
 }
 
 }  // namespace cc