Revert "Accelerate the lighten blendmode if GL_EXT_blend_minmax is enabled."

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 a21f63060cb24fb40775bf84a9f47af01348db1c..9be747de433a2c8741a5702d8a607516d69db745 100644
--- a/gpu/command_buffer/service/feature_info.cc
+++ b/gpu/command_buffer/service/feature_info.cc
@@ -144,7 +144,6 @@ FeatureInfo::FeatureFlags::FeatureFlags()
       angle_texture_usage(false),
       ext_texture_storage(false),
       chromium_path_rendering(false),
-      ext_blend_minmax(false),
       blend_equation_advanced(false),
       blend_equation_advanced_coherent(false) {
 }
@@ -820,7 +819,6 @@ void FeatureInfo::InitializeFeatures() {
 
   if (is_es3 || extensions.Contains("GL_EXT_blend_minmax") ||
       gfx::HasDesktopGLFeatures()) {
-    feature_flags_.ext_blend_minmax = true;
     AddExtensionString("GL_EXT_blend_minmax");
     validators_.equation.AddValue(GL_MIN_EXT);
     validators_.equation.AddValue(GL_MAX_EXT);