Update search tour for 34.0.5 users. Bug 1108671.

To test, use version 34.0 or greater:

In `about:config`, add local testing URL to `browser.uitour.testingOrigins` and set `browser.uitour.requireSecure` to `false`.

Then, hit the following URLs:

- /en-US/firefox/34.0.5/whatsnew/?oldversion=33.0 - should show doorhanger for all search engines, Sync promo if Yahoo! not default search, search messaging (1 of 3 variants) if Yahoo! is default search
- /en-US/firefox/35.0/whatsnew/?oldversion=33.0 - same as above
- /en-US/firefox/34.0.5/whatsnew/?oldversion=35.0 - should show Sync promo and *no* doorhanger
- /en-US/firefox/34.0/whatsnew/?oldversion=33.0 - if Google is default search, should show doorhanger and 1 of 3 search messaging variants (current production functionality)