gpu: Use workarounds to selectively enable CMAA

gpu/command_buffer/service/feature_info.h

Index: gpu/command_buffer/service/feature_info.h
diff --git a/gpu/command_buffer/service/feature_info.h b/gpu/command_buffer/service/feature_info.h
index c907ad48271a18d7a66a892255c98c0df26ef9d4..ff2222fbc2bb7eb7df5e251dcca15fa0573635d4 100644
--- a/gpu/command_buffer/service/feature_info.h
+++ b/gpu/command_buffer/service/feature_info.h
@@ -193,9 +193,6 @@ class GPU_EXPORT FeatureInfo : public base::RefCounted<FeatureInfo> {
   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);
 };