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When creating app tiles, use HTML template data rather than constructing the hiearchy
in javascript.  Also move style data to the CSS file.  This should improve flexibility
for making future changes.

BUG=none
TEST=Verify that app tiles continue to look and behave the same.
Review URL: http://codereview.chromium.org/8008005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@102398 0039d316-1c4b-4281-b951-d872f2087c98