Revert 233768 "PPAPI: Add a test to make sure we detect crashes"

> PPAPI: Add a test to make sure we detect crashes
> 
> And bonus check that other tests *don't* crash. (Though it should be very rare that a test results in "PASS" and still crashes)
> 
> Earlier patchsets have a fix for 244900, but we decided not to fix that. Because of 244900, we don't detect crashes on shutdown...  so this doesn't actually cause test failures for 243118. But it's useful to make sure we don't regress on showing the infobar in crashes that happen prior to shutdown.
> 
> BUG=244900,243118,247128
> 
> Review URL: https://codereview.chromium.org/16114007

TBR=dmichael@chromium.org

Review URL: https://codereview.chromium.org/60733014

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@233823 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 233823