Also need to set aura::Window title

Since each DesktopNativeWidgetAura uses a sole aura::Window as its
backed, once the title of native widget gets updated, the title of
aura::Window should also be updated in addition to updating the
XWindow created by DesktopRootWindowHostX11.

BUG=crosswalk-project/crosswalk#191
TEST=xwalk_browsertest --gtest_filter=XWalkRuntimeTest.GetWindowTitle

Conflicts:
	ui/views/widget/desktop_aura/desktop_native_widget_aura.cc

Rework with 34.0.1847.45 code base

ui/views/widget/desktop_aura/desktop_native_widget_aura.cc

@@ -644,6 +644,7 @@ void DesktopNativeWidgetAura::GetWindowPlacement(
 bool DesktopNativeWidgetAura::SetWindowTitle(const base::string16& title) {
   if (!content_window_)
     return false;
+  content_window_->SetTitle(title);
   return desktop_window_tree_host_->SetWindowTitle(title);
 }