gpu: Use workarounds to selectively enable CMAA

gpu/command_buffer/service/feature_info.h

 // 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.
 
 #ifndef GPU_COMMAND_BUFFER_SERVICE_FEATURE_INFO_H_
 #define GPU_COMMAND_BUFFER_SERVICE_FEATURE_INFO_H_
 
 #include <memory>
 #include <string>
 
@@ skipping 175 matching lines @@
 
   bool chromium_color_buffer_float_rgba_available_;
   bool chromium_color_buffer_float_rgb_available_;
   bool ext_color_buffer_float_available_;
   bool oes_texture_float_linear_available_;
   bool oes_texture_half_float_linear_available_;
 
   bool disable_shader_translator_;
   std::unique_ptr<gl::GLVersionInfo> gl_version_info_;
 
-  // Whether the command line switch kEnableCMAAShaders is passed in.
-  bool enable_cmaa_shaders_switch_;
-
   DISALLOW_COPY_AND_ASSIGN(FeatureInfo);
 };
 
 }  // namespace gles2
 }  // namespace gpu
 
 #endif  // GPU_COMMAND_BUFFER_SERVICE_FEATURE_INFO_H_