Revert change in r31143 which caused crash signal msg size to change and subsequent read to fail.
Revert change in r31143 which caused crash signal msg size to change and subsequent read to fail.

This was causing MetricsServiceTest.CrashRenderers to fail on Linux branded builds with CHROME_HEADLESS set:
http://build.chromium.org/buildbot/waterfall.fyi/builders/Google%20Chrome%20Linux/builds/4723/steps/ui_tests/logs/CrashRenderers

Review URL: http://codereview.chromium.org/414010


git-svn-id: http://src.chromium.org/svn/trunk/src@32575 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: 4371d07e9fa05c139661e868aaad74420aa1efe5
meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser