Remove writeBytes from HTML renderer via refactoring.
Remove writeBytes from HTML renderer via refactoring.

Qwiklabs/codelab-tools,googlecodelabs/tools,googlecodelabs/tools,googlecodelabs/tools,googlecodelabs/tools,Qwiklabs/codelab-tools,Qwiklabs/codelab-tools,Qwiklabs/codelab-tools