Clarify that set noparent should be rarely used

[email protected]

Change-Id: I049857e9eb094d60e153074b361dab7146a13623
Reviewed-on: https://chromium-review.googlesource.com/596968
Commit-Queue: Brett Wilson <[email protected]>
Reviewed-by: Brett Wilson <[email protected]>
Cr-Commit-Position: refs/heads/master@{#491425}
1 file changed