remove remaining mentions of  BROWSER_SHARED_RELRO_CONFIG

Those remained only in docs. Also correcting the stale fact of not
sharing RELROs with the browser process.

Bug: 981599
Change-Id: Ib33c09e4557d798e67a69e5acb4b85e7c77c57ad
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1709309
Auto-Submit: Egor Pasko <pasko@chromium.org>
Reviewed-by: Andrew Grieve <agrieve@chromium.org>
Commit-Queue: Andrew Grieve <agrieve@chromium.org>
Cr-Commit-Position: refs/heads/master@{#678841}
1 file changed