Merged r20436 into 3.25 branch.

tools: strip whitespace in gen-postmortem-metadata.py

R=yangguo@chromium.org
BUG=

Review URL: https://codereview.chromium.org/222133004

git-svn-id: https://v8.googlecode.com/svn/branches/3.25@20438 ce2b1a6d-e550-0410-aec6-3dcde31c8c00