DO NOT MERGE Fix vanishing title/url in window picker

 Bug: 2289137
 This was caused by two bugs. The first is that when creating
 picker data from a webview, it created a new instance of picker
 data before checking if there was actually data to use.
 The second is that when the webview of a tab was restored, it would
 clear the old picker data, which it shouldn't have done.

Change-Id: Ib03a22e32d35f0f686dffc663adcbbddba28db9b
1 file changed