Cleanup of v8 extension stuff. Playback extension is only used in chrome, so move it to chrome\rend…

Cleanup of v8 extension stuff. Playback extension is only used in chrome, so move it to chrome\renderer and all of its associated switches to chrome. GC extension is only used by webkit\support, so move it there. The other two profiler extensions aren't used, so remove them.
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=132841

[Avi (use Gerrit), 2012-04-18 16:05:52]

lgtm

[jam, 2012-04-18 17:22:49]

Tony: can you please look at the webkit changes? I don't think anyone uses
test_shell with playback mode stuff. I also don't see anyone using the
"profiler" or "heap-profiler" switches with it.

[jam, 2012-04-18 18:29:54]

->jamesr since tony is gone

[jamesr, 2012-04-18 18:40:14]

webkit/ stuff LGTM if you're sure nobody is using it

does playback mode work in content_shell? it's useful for benchmarking

[jam, 2012-04-18 19:04:12]

On 2012/04/18 18:40:14, jamesr wrote:
> webkit/ stuff LGTM if you're sure nobody is using it

i couldn't see people using it in test_shell by searching on cs (i could see
tests using it through chrome/browser_tests)

> 
> does playback mode work in content_shell? it's useful for benchmarking

no it doesn't work. is there a need for it?