Create a new browser using the window parameters specified by |windowInfo|.
If |request_context| is NULL the global request context will be used. This
function can only be called on the browser process UI thread. The optional
|extra_info| parameter provides an opportunity to specify extra information
specific to the created browser that will be passed to
Create a new browser using the window parameters specified by |windowInfo|. If |request_context| is NULL the global request context will be used. This function can only be called on the browser process UI thread. The optional |extra_info| parameter provides an opportunity to specify extra information specific to the created browser that will be passed to