Remove unused feedback class in dom distiller component

components/dom_distiller/core/experiments.cc

Index: components/dom_distiller/core/experiments.cc
diff --git a/components/dom_distiller/core/experiments.cc b/components/dom_distiller/core/experiments.cc
index cc882d1f0fb469d47a161261cf08eac66154932a..900daecd4b50191ebee2d68ceba68582b543f0e0 100644
--- a/components/dom_distiller/core/experiments.cc
+++ b/components/dom_distiller/core/experiments.cc
@@ -47,29 +47,4 @@ DistillerHeuristicsType GetDistillerHeuristicsType() {
   }
   return DistillerHeuristicsType::ADABOOST_MODEL;
 }
-
-bool ShouldShowFeedbackForm() {
-  const std::string group_name =
-      base::FieldTrialList::FindFullName("ReaderModeUIFeedback");
-  const std::string switch_value =
-      base::CommandLine::ForCurrentProcess()->GetSwitchValueASCII(
-          switches::kReaderModeFeedback);
-  if (switch_value != "") {
-    if (switch_value == switches::reader_mode_feedback::kOn) {
-      return true;
-    }
-    if (switch_value == switches::reader_mode_feedback::kOff) {
-      return false;
-    }
-    NOTREACHED() << "Invalid value for " << switches::kReaderModeFeedback;
-  } else {
-    if (group_name == "DoNotShow") {
-      return false;
-    }
-    if (group_name == "Show") {
-      return true;
-    }
-  }
-  return false;
-}
 }