Speedtracer cannot work with Chrome DevTools at the same time

[GoogleCodeExporter]

Provide a description of the buggy behavior observed:

What steps will reproduce the problem?
1. Open Chrome DevTools,
2. Open speedtracer
3. You will see: 
Pfffttt, Speed Tracer is not working.

Please double check a couple of things:
You must start Chrome with the flag: --enable-extension-timeline-api
You must be running the Chrome Dev channel.
For more details, see our getting started docs.

Give a description of the behavior you expected to see.

Working normally.

The version of Speed Tracer (check the chrome://extensions url)

0.24

The build of Chrome you are using (check the About Chrome dialog)

Google Chrome   16.0.899.0 (Official Build 103668) dev
OS  Linux
WebKit  535.6 (@96469)
JavaScript  V8 3.6.4.1

Please also provide any exceptions or screenshots that would be pertinent.
See http://code.google.com/p/speedtracer/wiki/HowToReportAnIssue

Original issue reported on code.google.com by ls...@google.com on 5 Oct 2011 at 6:04

[GoogleCodeExporter]

Same problem with the same configuration (except of OS Windows 7 pro 64 bit) 

Original comment by paolo.zi...@gmail.com on 9 Oct 2011 at 1:26