[rubygems/rubygems] Stop fighting with ourselves

https://github.com/rubygems/rubygems/commit/7cf2fdcfa1

lib/bundler/rubygems_ext.rb

@@ -123,11 +123,6 @@ module Gem
       end
     end
 
-    remove_method :gem_dir
-    def gem_dir
-      full_gem_path
-    end
-
     unless const_defined?(:LATEST_RUBY_WITHOUT_PATCH_VERSIONS)
       LATEST_RUBY_WITHOUT_PATCH_VERSIONS = Gem::Version.new("2.1")
 

lib/rubygems/specification.rb

@@ -1913,7 +1913,7 @@ class Gem::Specification < Gem::BasicSpecification
   end
 
   ##
-  # Work around bundler removing my methods
+  # Work around old bundler versions removing my methods
 
   def gem_dir # :nodoc:
     super