Close all windows when app shim quits.

apps/app_shim/app_shim_messages.h

Index: apps/app_shim/app_shim_messages.h
diff --git a/apps/app_shim/app_shim_messages.h b/apps/app_shim/app_shim_messages.h
index 6a6cc6d07a88f25a95c0d55b77931c41c1faa938..e385b81db47586f26e8d04873e2dfddd2df3d632 100644
--- a/apps/app_shim/app_shim_messages.h
+++ b/apps/app_shim/app_shim_messages.h
@@ -25,3 +25,7 @@ IPC_MESSAGE_CONTROL2(AppShimHostMsg_LaunchApp,
 // clicking on the app's icon in the dock or by selecting it with Cmd+Tab. In
 // response, Chrome brings the app's windows to the foreground.
 IPC_MESSAGE_CONTROL0(AppShimHostMsg_FocusApp)
+
+// Sent when the user quits the app. Once the app closes, the AppShimHost
+// terminates the channel to the shim, and the shim exits.

[tapted, 2013/05/27 06:44:29]

nit: Maybe it is confusing using quit, close and exit in the same comment (all
with different meanings!)

Perhaps something along the lines of, ~"Sent when the shim process receives a
request to terminate. Once all the app's windows have closed, and the extension
is unloaded, the AppShimHost closes the channel. The shim process then completes
the terminate request and exits."

[jackhou1, 2013/05/28 07:30:22]

Done.

+IPC_MESSAGE_CONTROL0(AppShimHostMsg_QuitApp)