Mac single-process mode fails timer assertion after some time

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What steps will reproduce the problem?
1. build cefclient on 10.7 or 10.8 with Xcode 4.6.2
2. launch cefclient in Debug with the --single-process argument
3. wait (doing things or let it just sit in the background). Time to crash is 
highly variable. Between 3/4 second and 25 minutes so far.

What is the expected output? 
App should continue to work indefinitely. I thought for a long time that this 
was something in our code, some initialization done out of order, but the same 
things happens in the cefclient test app. 

What do you see instead?
Assertion fails, app crashes. Frame 14 of thread 1 is almost always in the 
stack trace (always in cefclient, usually in my app)

What version of the product are you using? On what operating system?
3.1453.1255, OS X 10.8.3 12D78, Xcode 4.6.2 (4H1003). Reproducible in my own 
app in CEF3 1180 and 1271 and 1453; never ran cefclient long enough to cause 
the crash on those builds. 

Please provide any additional information below.
See attached stack traces.

Original issue reported on code.google.com by chao...@gmail.com on 14 May 2013 at 1:32

Attachments:

• [cefclient stack traces.txt](https://storage.googleapis.com/google-code-attachments/chromiumembedded/issue-978/comment-0/cefclient stack traces.txt)

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Original comment by magreenb...@gmail.com on 14 Mar 2015 at 3:25