[rubygems/rubygems] Remove unnecessary code

Somehow this is trying to relax frozen mode constraints for path
sources. It doesn't make sense to me and it's not covered by any spec so
I'm killing it.

https://github.com/rubygems/rubygems/commit/17c978e161

lib/bundler/definition.rb

@@ -379,12 +379,6 @@ module Bundler
       new_deps = @dependencies - locked_dependencies
       deleted_deps = locked_dependencies - @dependencies
 
-      # Check if it is possible that the source is only changed thing
-      if (new_deps.empty? && deleted_deps.empty?) && (!new_sources.empty? && !deleted_sources.empty?)
-        new_sources.reject! {|source| source.path? && source.path.exist? }
-        deleted_sources.reject! {|source| source.path? && source.path.exist? }
-      end
-
       if @locked_sources != gemfile_sources
         if new_sources.any?
           added.concat new_sources.map {|source| "* source: #{source}" }