Disable framebuffer discarding on Mali-4xx and clean up.

gpu/command_buffer/service/feature_info.cc

Index: gpu/command_buffer/service/feature_info.cc
diff --git a/gpu/command_buffer/service/feature_info.cc b/gpu/command_buffer/service/feature_info.cc
index 336a0423c67ca318fc071b447d61d3979296f58c..dcbdb8fbf37a99c59db6bd812895dde8e0156f8b 100644
--- a/gpu/command_buffer/service/feature_info.cc
+++ b/gpu/command_buffer/service/feature_info.cc
@@ -1005,7 +1005,7 @@ void FeatureInfo::InitializeFeatures() {
 
   if ((gl_version_info_->is_es3 ||
        extensions.Contains("GL_EXT_discard_framebuffer")) &&
-      !workarounds_.disable_ext_discard_framebuffer) {
+      !workarounds_.disable_discard_framebuffer) {
     // DiscardFramebufferEXT is automatically bound to InvalidateFramebuffer.
     AddExtensionString("GL_EXT_discard_framebuffer");
     feature_flags_.ext_discard_framebuffer = true;