Fix quotation marks

src/google/protobuf/compiler/js/js_generator.cc

@@ -193,7 +193,7 @@ string ModuleAlias(const string& filename) {
   string basename = StripProto(filename);
   StripString(&basename, "-", '$');
   StripString(&basename, "/", '_');
-  StripString(&basename, “.”, '_');
+  StripString(&basename, ".", '_');
   return basename + "_pb";
 }