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This fixes an oversight from https://codereview.chromium.org/307483002.

"Before" screenshot: https://drive.google.com/a/google.com/file/d/0BxTU2YPRG-lRNl9FRy1KQ2c2dEU/view?usp=sharing
Mock: https://folio.googleplex.com/chrome-ux/mocks/064-chrome-away-from-chrome/supervised-users/mirror#%2FPlaypen_210514_mirror-11.png

BUG=310640

Review URL: https://codereview.chromium.org/443033003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@287828 0039d316-1c4b-4281-b951-d872f2087c98