There is now only a single project generated from gn, so update the
documentation to remove reference to the workspace (and remove old
warnings against opening the project directly).
Bug: none
Change-Id: I8d19c078159154c740e9c7fae5b72b62b1997ce3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2267097
Commit-Queue: Sylvain Defresne <sdefresne@chromium.org>
Reviewed-by: Misha Efimov <mef@chromium.org>
Auto-Submit: Sylvain Defresne <sdefresne@chromium.org>
Cr-Commit-Position: refs/heads/master@{#782952}