Stop Reload Android Webview On Same URL Before

Summary:
Because it is react, the url could be changed on redirection or some other ways.
The iOS version's WebView has controled that on [here](https://github.com/facebook/react-native/blob/master/React/Views/RCTWebView.m#L106).
But the Android's one is not.

Check the url is same with privous url. If it is true, cancel loading.
This logic is same with iOS's.

the ```method``` hasn't compared.

Test urls as we can.
The Google Map(https://map.google.com) was one of the site which has occur error before this commit.

related issue : #9121
Closes https://github.com/facebook/react-native/pull/9126

Differential Revision: D3663685

Pulled By: javache

fbshipit-source-id: f38c9012ee077677543dafcea83c0778a4471bfa