Rename show_stay_in_chrome to enable_stay_in_chrome.

This bool variable determines whether the stay in chrome button is
enabled rather than whether it is visible or hidden. Fixing to reduce
confusion.

Bug: 978724
Change-Id: I9ba59c7b44e758b73b3e285533233cb434a0c56b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1694382
Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Maggie Cai <mxcai@chromium.org>
Commit-Queue: Melissa Zhang <melzhang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#677569}
10 files changed