Two reasons for this change:
1. Default value of the tags option in Vim (that tells it
where to load tags from) is: "tags=./tags,./TAGS,tags,TAGS"
So now Vim should be able to pick up tags with default
settings when current dir is chromium/src
2. src/.gitignore already has "tags" in it, but not ".tags"
which, I think, indicates that people expect the tags file
name to not have a leading dot
BUG=none
Review URL: https://codereview.chromium.org/791723002
Cr-Original-Commit-Position: refs/heads/master@{#307539}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: fbc0ebe4967befb4643a3e286b0f8f376322dc07
servolk
jww@chromium.org