The BWebDownload was using BWebPage for stuff, but the BWebPage can be long

gone when a BWebDownload wanted to use it. Now the class is more self-sufficient.
One example of the problem was clicking a link that opens a blank page, then
closing that page while the download was still loading. 1) The download finished
notification never arrived and 2) clicking to cancel the download would crash
after the download finished, since really it had already selfdestructed...

git-svn-id: http://svn.haiku-os.org/webpositive/webkit/trunk@240 94f232f2-1747-11df-bad5-a5bfde151594

src/apps/webpositive/DownloadWindow.cpp

@@ -272,6 +272,12 @@ public:
         	// TOAST!
             return;
         }
+        case B_DOWNLOAD_REMOVED:
+            // TODO: This is a bit asymetric. The removed notification
+            // arrives here, but it would be nicer if it arrived
+            // at the window...
+            Window()->PostMessage(message);
+            break;
         default:
             BGridView::MessageReceived(message);
         }