No longer save number of private windows on exit. Fixes #1899 (#1902)

Author: bluemarvin

app/src/common/shared/org/mozilla/vrbrowser/ui/widgets/Windows.java

@@ -66,7 +66,6 @@ public void load(WindowWidget aWindow) {
     class WindowsState {
         WindowPlacement focusedWindowPlacement = WindowPlacement.FRONT;
         ArrayList<WindowState> regularWindowsState = new ArrayList<>();
-        ArrayList<WindowState> privateWindowsState = new ArrayList<>();
         boolean privateMode = false;
     }
 
@@ -132,11 +131,6 @@ private void saveState() {
                 windowState.load(window);
                 state.regularWindowsState.add(windowState);
             }
-            for (WindowWidget window : mPrivateWindows) {
-                WindowState windowState = new WindowState();
-                windowState.load(window);
-                state.privateWindowsState.add(windowState);
-            }
             Gson gson = new GsonBuilder().setPrettyPrinting().create();
             gson.toJson(state, writer);
 
@@ -578,11 +572,6 @@ private void restoreWindows() {
                 WindowWidget window = addWindow(windowState);
                 window.getSessionStack().restore(windowState.sessionStack, windowState.currentSessionId);
             }
-            mPrivateMode = true;
-            for (WindowState windowState : windowsState.privateWindowsState) {
-                WindowWidget window = addWindow(windowState);
-                window.getSessionStack().restore(windowState.sessionStack, windowState.currentSessionId);
-            }
             mPrivateMode = !windowsState.privateMode;
             if (windowsState.privateMode) {
                 enterPrivateMode();