Bug 473161 - Fix imgRequest::Cancel() to call Cancel() on the loadgroup instead of the channel. The fix to bug 89419 included a mistaken change from cancelling the loadgroup to cancelling the channel. r=bzbarsky, sr=vladimir, a=blocking1.9.1+

modules/libpr0n/src/imgRequest.cpp

@@ -348,8 +348,8 @@ void imgRequest::Cancel(nsresult aStatus)
     RemoveFromCache();
   }
 
-  if (mChannel && mLoading)
-    mChannel->Cancel(aStatus);
+  if (mRequest && mLoading)
+    mRequest->Cancel(aStatus);
 }
 
 void imgRequest::CancelAndAbort(nsresult aStatus)