NTP: Fix click issues with about: and file: most visited thumbnails
NTP: Fix click issues with about: and file: most visited thumbnails

The reason these were not working correctly was that the handler for file: and
about: links was attached using capturing so the handler was always triggered.
This changes the events to use bubbling instead. This allows other listeners to
preventDefault before handleLinkClickOrMouseUp is reached.

BUG=72213
TEST=On the NTP
     Show most visited and visit some about: or file: URL enough for it to show up.
     Try to blacklist or pin the item.
     We should not navigate to the URL.

Review URL: http://codereview.chromium.org/6246146

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@74033 0039d316-1c4b-4281-b951-d872f2087c98

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