rewrite - more convert script changes (GoogleCloudPlatform#11799)

mmv1/provider/file_template.rb

@@ -36,13 +36,6 @@ class FileTemplate
     # Once the file's contents are written, set the proper [chmod] mode and
     # format the file with a language-appropriate formatter.
     def generate(pwd, template, path, provider)
-      # If we've modified a file since starting an MM run, it's a reasonable
-      # assumption that it was this run that modified it.
-      if File.exist?(path) && File.mtime(path) > @env[:start_time]
-        raise "#{path} was already modified during this run.. check to see if " \
-              'there is both a .go and .go.erb version of this file'
-      end
-
       # You're looking at some magic here!
       # This is how variables are made available in templates; we iterate
       # through each key:value pair in this object, and we set them