Revert "Some comments and FrameMsg_New."

This reverts commit 0f68a653988546ef513287bdfb9172d294e85a57.
Revert "Fixing UpdateFontRenderingFromRendererPrefs to have empty body on all platforms."

This reverts commit bdceee67a4a62c96a743a22ce6fc56931d7091ea.
Revert "Duplicating RenderView(Host) into RenderFrame(Host)."

This reverts commit 3587761c9b23858920f4274351494f53bb184725.