Merge 144251 - Now doesn't wait to destroy non-incognito profiles, and allow immediate destruction …

Merge 144251 - Now doesn't wait to destroy non-incognito profiles, and allow immediate destruction of incognito profiles from their parent profile. Also, doesn't wait infinitely for render process hosts to go away, uses a timer to complete destruction. And finally, adds DCHECKs to identify when render process hosts are dead soon enough.

BUG=130772
TEST=Make sure Chrome exits without a crash and that Profile info properly got saved. Also make sure info doesn't leak from one incognito session to another.

Review URL: https://chromiumcodereview.appspot.com/10645005

TBR=mad@chromium.org
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=145740

[MAD, 2012-07-09 21:22:34]

self-lgtm... ;-)