Bug 107485 nsPluginHostImpl's shutdown listener should be a weak reference

patch by adu@sparc.spb.su r=dougt sr=darin

modules/plugin/base/src/nsPluginHostImpl.cpp

@@ -1681,7 +1681,7 @@ nsPluginCacheListener::~nsPluginCacheListener()
 
 
 ////////////////////////////////////////////////////////////////////////
-NS_IMPL_ISUPPORTS1(nsPluginCacheListener, nsIStreamListener)
+NS_IMPL_ISUPPORTS2(nsPluginCacheListener, nsIStreamListener, nsISupportsWeakReference)
 ////////////////////////////////////////////////////////////////////////
 NS_IMETHODIMP
 nsPluginCacheListener::OnStartRequest(nsIRequest *request, nsISupports* ctxt)
@@ -2604,8 +2604,8 @@ nsPluginHostImpl::nsPluginHostImpl()
   nsCOMPtr<nsIObserverService> obsService = do_GetService("@mozilla.org/observer-service;1");
   if (obsService)
   {
-    obsService->AddObserver(this, "quit-application", PR_FALSE);
-    obsService->AddObserver(this, NS_XPCOM_SHUTDOWN_OBSERVER_ID, PR_FALSE);
+    obsService->AddObserver(this, "quit-application", PR_TRUE);
+    obsService->AddObserver(this, NS_XPCOM_SHUTDOWN_OBSERVER_ID, PR_TRUE);
   }
 
 #ifdef PLUGIN_LOGGING

modules/plugin/base/src/nsPluginHostImpl.h

@@ -51,6 +51,7 @@
 #include "nsPluginsDir.h"
 #include "nsVoidArray.h"  // array for holding "active" streams
 #include "nsIDirectoryService.h"
+#include "nsWeakReference.h"
 #include "nsWeakPtr.h"
 
 class ns4xPlugin;
@@ -177,7 +178,8 @@ class nsPluginHostImpl : public nsIPluginManager2,
                          public nsIFileUtilities,
                          public nsICookieStorage,
                          public nsIObserver,
-                         public nsPIPluginHost
+                         public nsPIPluginHost,
+                         public nsSupportsWeakReference
 {
 public:
   nsPluginHostImpl();