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Small tweak to about:profiler -- make the labels for checkboxes clickable (so you have a bigger target to click on than just the tiny checkbox).

Apparently if you surround an <input type=checkbox> within a <label> tag, the text will activate the checkbox.
Review URL: http://codereview.chromium.org/8601003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@110995 0039d316-1c4b-4281-b951-d872f2087c98