Another cleanup.

src-electron/sdk-gen/sdk-gen.js

@@ -29,6 +29,7 @@ function cleanse(name) {
   ret = ret.replace(/\(/g, '')
   ret = ret.replace(/\)/g, '')
   ret = ret.replace(/\#/g, '')
+  ret = ret.replace(/\:/g, '_')
   ret = ret.toLowerCase()
   return ret
 }