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This fixes an issue where "last updated" data would be displayed before date
was populated, showing some weird data. I tried to use "template if" to
restrict when this would be painted, but couldn't get that to work, so I
resorted to using styling instead.

NOTRY=true
BUG=402661

Review URL: https://codereview.chromium.org/466783002

git-svn-id: svn://svn.chromium.org/blink/trunk@180100 bbb929c8-8fbe-4397-9dbb-9b2b20218538