Bug 1280964 - fix gtk+2 build problems in widget/gtk/; r=karlt

widget/gtk/nsDragService.cpp

@@ -441,7 +441,7 @@ nsDragService::SetAlphaPixmap(SourceSurface *aSurface,
     // Make a DrawTarget wrapped around the pixmap to render on
     RefPtr<DrawTarget> dt =
          nsWindow::GetDrawTargetForGdkDrawable(GDK_DRAWABLE(pixmap),
-                                               IntRect(dragRect.width,
+                                               IntSize(dragRect.width,
                                                        dragRect.height));
     if (!dt)
       return false;

widget/gtk/nsWindow.h

@@ -321,7 +321,7 @@ public:
 
 #if (MOZ_WIDGET_GTK == 2)
     static already_AddRefed<DrawTarget> GetDrawTargetForGdkDrawable(GdkDrawable* aDrawable,
-                                                                    const IntSize& aSize);
+                                                                    const mozilla::gfx::IntSize& aSize);
 #endif
     NS_IMETHOD         ReparentNativeWidget(nsIWidget* aNewParent) override;