Revert 33255 - Report active extensions in crash reports. This only implement...

Revert 33255 - Report active extensions in crash reports. This only implements Windows right now. Mac and linux will be separate CLs.

"Active" is overloaded to mean different things depending on
the process type:

 browser: all enabled extensions
 renderer: unique set of extensions from all user scripts
 extension: extensions running in the process

BUG=27169
Review URL: http://codereview.chromium.org/437078

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There are thousands of new crashes with reivison 33256 and 33255, so i'm
reverting. the crashes are in chrome_2610000!child_process_logging::SetActiveURL



TBR=aa@chromium.org

Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=33269