[sailfish-browser] Fix failing tst_webview

Adds updateUrl and updateTitle helper methods to DeclarativeWebContainer
so that url or title won't get emitted if not really changed.

Revers title changes does to DeclarativeWebContainer::onActiveTabChanged
in SHA1 ad85e79d.
Merge pull request #193 from rainemak/tstWebView

[sailfish-browser] Fix failing tst_webview