Initialize breakpad client for content_shell

Run content shell with --enable-crash-reporter --crash-dumps-dir=/path to
enable breakpad.

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

Review URL: https://codereview.chromium.org/32423009

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@230669 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 230669