AppShell: Ignore channel requirements of extension API features

extensions/common/features/feature.h

Index: extensions/common/features/feature.h
diff --git a/extensions/common/features/feature.h b/extensions/common/features/feature.h
index b04dba2f2a851c16b73b29d99f9cd041298daef6..d3179bb9b2a21b40a75ddc808f05296699275590 100644
--- a/extensions/common/features/feature.h
+++ b/extensions/common/features/feature.h
@@ -150,15 +150,11 @@ class Feature {
   virtual bool IsIdInBlacklist(const std::string& extension_id) const = 0;
   virtual bool IsIdInWhitelist(const std::string& extension_id) const = 0;
 
-  void set_check_channel(bool check_channel) { check_channel_ = check_channel; }
-
  protected:
   std::string name_;
   std::string alias_;
   std::string source_;
   bool no_parent_;
-  // TODO(devlin): Remove this once we set the feature channel for tests.
-  bool check_channel_;
 };
 
 }  // namespace extensions