Fix the issues identified so far while investigating bug 66962, but not

      necessarily the underlying issue.

BUG=66962
TEST=manually open n copies of print.html as described in the bug entry.

Review URL: http://codereview.chromium.org/6121003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@71244 0039d316-1c4b-4281-b951-d872f2087c98