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In the switchover from history2, the ability to select multiple history search results
(using the checkboxes) was lost. This CL restores that ability, and fixes some style
issues with the search results page.

BUG=106394
TEST=Manual: open chrome://history, do a search, and ensure that you can select and
delete multiple items.

Review URL: http://codereview.chromium.org/8807001

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@113044 0039d316-1c4b-4281-b951-d872f2087c98