Don't print deprecation warnings every time the user reads or writes an...

Don't print deprecation warnings every time the user reads or writes an inheritable attribute.  The warnings on declaration is enough.

activesupport/lib/active_support/core_ext/class/inheritable_attributes.rb

@@ -130,7 +130,6 @@ def inheritable_attributes
   end
 
   def write_inheritable_attribute(key, value)
-    ActiveSupport::Deprecation.warn ClassInheritableAttributes::DEPRECATION_WARNING_MESSAGE
     if inheritable_attributes.equal?(EMPTY_INHERITABLE_ATTRIBUTES)
       @inheritable_attributes = {}
     end
@@ -148,7 +147,6 @@ def write_inheritable_hash(key, hash)
   end
 
   def read_inheritable_attribute(key)
-    ActiveSupport::Deprecation.warn ClassInheritableAttributes::DEPRECATION_WARNING_MESSAGE
     inheritable_attributes[key]
   end