Add note to prefer web::WebFrame API over WebState::ExecuteJavaScript.

Bug: 905939
Change-Id: Iae8ed5b83aa8bb384ed2c8e65f345547f188a986
Reviewed-on: https://chromium-review.googlesource.com/c/1357382
Reviewed-by: Eugene But <eugenebut@chromium.org>
Commit-Queue: Mike Dougherty <michaeldo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#613217}
1 file changed