Bug 1230047 (part 2) - Make several PaintWindow() functions use LayoutDevice coordinates. r=kats.

Specifically, the PaintWindow() functions in the following classes:
- nsIWidgetListener, and its subclasses nsView and nsWebBrowser;
- nsChildView;
- nsWindow (the one in widget/uikit/);
- nsViewManager.

widget/PuppetWidget.cpp

@@ -999,7 +999,7 @@ PuppetWidget::Paint()
       ctx->Clip();
       AutoLayerManagerSetup setupLayerManager(this, ctx,
                                               BufferMode::BUFFER_NONE);
-      GetCurrentWidgetListener()->PaintWindow(this, region.ToUnknownRegion());
+      GetCurrentWidgetListener()->PaintWindow(this, region);
       if (mTabChild) {
         mTabChild->NotifyPainted();
       }