Gallery: Disable name input when the selection is empty.
Gallery: Disable name input when the selection is empty.

BUG=405820
TEST=manually
TBR=yoshiki@chromium.org

Review URL: https://codereview.chromium.org/490113002

Cr-Commit-Position: refs/heads/master@{#291020}
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@291020 0039d316-1c4b-4281-b951-d872f2087c98
(cherry picked from commit 6dd17f1f92dc1baafa8db1a554c68d6e9baf76cc)

Review URL: https://codereview.chromium.org/511733002

Cr-Commit-Position: 0d344d3782ceeadf0e8e8be3f4ce70193b218c54@{#123}
Cr-Branched-From: 2cb3f0147827a1600e8cbbcc52ca24c0febcb7a4@{#290040}

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