263845 - firefox branch unregisters IE as default browser when it shouldn't - make sure we don'tunregister ddeexec keys when we're not the default browser

git-svn-id: svn://10.0.0.236/branches/AVIARY_1_0_20040515_BRANCH@164044 18797224-902f-48f8-a5cc-f745e15eee43

mozilla/browser/components/shell/src/nsWindowsShellService.cpp

@@ -1082,6 +1082,11 @@ nsWindowsShellService::Observe(nsISupports* aObject, const char* aTopic, const P
     return RegisterDDESupport();
   }
   else if (!nsCRT::strcmp("quit-application", aTopic)) {
+    PRBool isDefault;
+    IsDefaultBrowser(PR_FALSE, &isDefault);
+    if (!isDefault)
+      return NS_OK;
+
     nsCOMPtr<nsIObserverService> os(do_GetService("@mozilla.org/observer-service;1"));
     os->RemoveObserver(this, "quit-application");