Fatal Exception occured due to "not attached to window" on AndroidP

Steps to reproduce:
1. Open InAppBrowser on cordova app.
2. Move to Settings.
3. Setting > Display > Display size. Then change display size.
4. Resume cordova app.
Then, App is crashed by fatal exception.

```
Process: com.myapp, PID: 18768
java.lang.IllegalArgumentException: View=DecorView@fb121f3[MainActivity] not attached to window manager
at android.view.WindowManagerGlobal.findViewLocked(WindowManagerGlobal.java:497)
at android.view.WindowManagerGlobal.removeView(WindowManagerGlobal.java:406)
at android.view.WindowManagerImpl.removeViewImmediate(WindowManagerImpl.java:138)
at android.app.Dialog.dismissDialog(Dialog.java:375)
at android.app.Dialog.dismiss(Dialog.java:358)
at org.apache.cordova.inappbrowser.InAppBrowser$5$1.onPageFinished(Unknown Source:18)
at xf.c(SourceFile:251)
at afs.handleMessage(SourceFile:72)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loop(Looper.java:193)
at android.app.ActivityThread.main(ActivityThread.java:6813)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:522)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:889)
```
I think MainActivity have been destroyed and dialog is detacched when Display size is changed.
But InAppBrowser still have old dialog and try to dismiss() when app is resumed.
my-app\plugins\cordova-plugin-inappbrowser\src\android\InAppBrowser.java
```
public void closeDialog() {
this.cordova.getActivity().runOnUiThread(new Runnable() {
@Override
public void run() {
final WebView childView = inAppWebView;
// The JS protects against multiple calls, so this should happen only when
// closeDialog() is called by other native code.
if (childView == null) {
return;
}

childView.setWebViewClient(new WebViewClient() {
// NB: wait for about:blank before dismissing
public void onPageFinished(WebView view, String url) {
if (dialog != null) {
dialog.dismiss(); //!!!dialog is not attached to window
dialog = null;
}
}
});
```

This issue is not reproduced on Android O.
(onPageFinished is not called on Android O, So dialog.dismiss() is not called.)

Start in my-app\plugins\cordova-plugin-inappbrowser\src\android\InAppBrowser.java, focusing on closeDialog() and the onPageFinished callback that calls dialog.dismiss(). Reproduce the Android P display-size change sequence and verify that resuming the app no longer crashes when the old dialog is detached from the window.

Written by the indexing model from the issue text.