Seperate interface and implementation of 4 WebView classes

GeolocationPermissionsClassic
CookieManagerClassic
WebIconDatabaseClassic
WebStorageClassic

Also creats a WebViewFactory top level class - this remains hidden
for now, as it's currently only used implicitly by the other
public WebView classes to create the provider instances.

Bug: 5626244

Change-Id: Id0ca1c16d8058f31a86414bbc0e8a55db4b907ba