Linux: Fix crash reporting for subprocesses that do not run in the Zygote.
Linux: Fix crash reporting for subprocesses that do not run in the Zygote.

BUG=none
TEST=Plugin crashes generate crash reports.

Review URL: http://codereview.chromium.org/7239007

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@90268 0039d316-1c4b-4281-b951-d872f2087c98

gavinp/chromium,gavinp/chromium,adobe/chromium,adobe/chromium,adobe/chromium,ropik/chromium,yitian134/chromium,ropik/chromium,ropik/chromium,adobe/chromium,adobe/chromium,ropik/chromium,ropik/chromium,gavinp/chromium,adobe/chromium,ropik/chromium,gavinp/chromium,adobe/chromium,ropik/chromium,yitian134/chromium,yitian134/chromium,yitian134/chromium,adobe/chromium,adobe/chromium,gavinp/chromium,gavinp/chromium,yitian134/chromium,yitian134/chromium,adobe/chromium,gavinp/chromium,gavinp/chromium,yitian134/chromium,adobe/chromium,gavinp/chromium,yitian134/chromium,ropik/chromium,yitian134/chromium,ropik/chromium,gavinp/chromium,yitian134/chromium