Fix bug 2760. The webcrawler only registers itself as a document loader observer if the right command line arguments are given to viewer.

webshell/tests/viewer/nsBrowserWindow.cpp

@@ -1272,9 +1272,12 @@ nsBrowserWindow::SetWebCrawler(nsWebCrawler* aCrawler)
   }
   if (aCrawler) {
     mWebCrawler = aCrawler;
+    /* Nisheeth: the crawler registers as a document loader observer with
+     * the webshell when nsWebCrawler::Start() is called.
     if (mWebShell) {
       mWebShell->SetDocLoaderObserver(aCrawler);
     }
+    */
     NS_ADDREF(aCrawler);
   }
 }

webshell/tests/viewer/nsWebCrawler.cpp

@@ -435,9 +435,10 @@ void
 nsWebCrawler::Start()
 {
   // Enable observing each URL load...
-//  nsIWebShell* shell = nsnull;
-//  mBrowser->GetWebShell(shell);
-//  shell->SetObserver(this);
+  nsIWebShell* shell = nsnull;
+  mBrowser->GetWebShell(shell);
+  shell->SetDocLoaderObserver(this);
+  NS_RELEASE(shell);
   LoadNextURL();
 }
 
@@ -767,7 +768,7 @@ nsWebCrawler::LoadNextURL()
   if (mPostExit) {
     mViewer->Exit();
   }
-}
+} 
 
 nsIPresShell*
 nsWebCrawler::GetPresShell()