Send out notifications when docshells are created or destroyed. Bug 308438,

r=biesi, sr=darin


git-svn-id: svn://10.0.0.236/trunk@180400 18797224-902f-48f8-a5cc-f745e15eee43

mozilla/docshell/base/nsWebShell.cpp

@@ -1120,6 +1120,11 @@ nsWebShell::SelectNone(void)
 
 NS_IMETHODIMP nsWebShell::Create()
 {
+  if (mPrefs) {
+    // We've already been created
+    return NS_OK;
+  }
+  
   // Remember the current thread (in current and forseeable implementations,
   // it'll just be the unique UI thread)
   //