Add a warning to the top of base/memory/singleton.h

BUG=none
TEST=none

Review URL: http://codereview.chromium.org/7217014

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@89870 0039d316-1c4b-4281-b951-d872f2087c98


CrOS-Libchrome-Original-Commit: b727b041c938d45e82d2c42172f79533f1d196be
1 file changed
tree: e32acaeb56c656df8c231a1ded41cd8dbcdf5997
  1. base/
  2. build/
  3. ipc/
  4. testing/
  5. third_party/