Leave apps running on Windows and Linux when quitting Chrome from the wrench menu.

chrome/browser/lifetime/application_lifetime.h

Index: chrome/browser/lifetime/application_lifetime.h
diff --git a/chrome/browser/lifetime/application_lifetime.h b/chrome/browser/lifetime/application_lifetime.h
index 2f25219b0237025fdb7c5166b6c7b7090b6a5881..08afcd607d22f4ac85d847dbb0ab0f13c875188b 100644
--- a/chrome/browser/lifetime/application_lifetime.h
+++ b/chrome/browser/lifetime/application_lifetime.h
@@ -53,9 +53,13 @@ void AttemptExit();
 void ExitCleanly();
 #endif
 
+// Closes all browsers and if successful, quits.
+void CloseAllBrowsersAndQuit();
+
 // Closes all browsers. If the session is ending the windows are closed
 // directly. Otherwise the windows are closed by way of posting a WM_CLOSE
-// message.
+// message. This will quit the application if there is nothing other than
+// browser windows keeping it alive or the application is quitting.
 void CloseAllBrowsers();
 
 // Begins shutdown of the application when the desktop session is ending.