Deprecate findAddress() method

FindAddress method only ever worked on US addresses and being a part
of WebView API, it required the users that did not use WebView otherwise
to pay a heavy penalty. Further, it was also used by Linkify.

The new way to find addresses is using TextClassifier.

Bug: 22362008
Test: WebView.findAddress.

Change-Id: I772961bd20bff4817a060f14a843abeceb55ac92