Reverted metro exit sequence back to original one.

Change was introduced in https://codereview.chromium.org/235933004/

BUG=366175
R=ananta,cpu

Review URL: https://codereview.chromium.org/274793002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@269884 0039d316-1c4b-4281-b951-d872f2087c98

win8/metro_driver/chrome_app_view_ash.cc

@@ -925,12 +925,17 @@ void ChromeAppViewAsh::OnMetroExit(MetroTerminateMethod method) {
         core_window == ::GetForegroundWindow()) {
       DVLOG(1) << "We are in the foreground. Exiting via Alt F4";
       SendKeySequence(VK_F4, ALT);
+      if (ui_channel_)
+        ui_channel_->Close();
+    } else {
+      globals.app_exit->Exit();
     }
-  }
-  if (ui_channel_)
-    ui_channel_->Close();
+  } else {
+    if (ui_channel_)
+      ui_channel_->Close();
 
-  globals.app_exit->Exit();
+    globals.app_exit->Exit();
+  }
 }
 
 void ChromeAppViewAsh::OnInputSourceChanged() {