Ash: fix a crash with MetricsLogs accessing a deleted AshScreen pointer.

Make the AshScreen* screen_ a leaky object and annotate it as such to
suppress valgrind warnings.

The rationale is that it is a small structure and it is only leaked at
shutdown anyway.

BUG=156466
TEST=CQ


Review URL: https://chromiumcodereview.appspot.com/11193044

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@162904 0039d316-1c4b-4281-b951-d872f2087c98
2 files changed