Move process_dumps_linux.py to breakpad component

Currently, there's nothing that programmatically invokes this script, so
we can just move it.

R=thakis@chromium.org, rsesek@chromium.org
BUG=247431

Review URL: https://codereview.chromium.org/27893003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@229678 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 229678