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Before, the labels were not properly aligned. This patch aligns them by simplifying the css.

TEST=Enter Files.app, check carefully the headers. Click on the 'select all' checkbox.
BUG=175962

Review URL: https://codereview.chromium.org/12262032

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@182391 0039d316-1c4b-4281-b951-d872f2087c98