Fix GC hazards associated with event handlers on images only reachable from their current network loads, some of which are regressions from 241518. b=321054 r=darin sr=bzbarsky

git-svn-id: svn://10.0.0.236/trunk@198815 18797224-902f-48f8-a5cc-f745e15eee43

mozilla/layout/generic/nsImageFrame.cpp

@@ -2033,6 +2033,11 @@ nsImageListener::~nsImageListener()
 {
 }
 
+NS_IMETHODIMP nsImageListener::OnStartRequest(imgIRequest *aRequest)
+{
+  return NS_OK;
+}
+
 NS_IMETHODIMP nsImageListener::OnStartDecode(imgIRequest *aRequest)
 {
   // Not useful to us yet.
@@ -2089,6 +2094,12 @@ NS_IMETHODIMP nsImageListener::OnStopDecode(imgIRequest *aRequest,
   return mFrame->OnStopDecode(aRequest, status, statusArg);
 }
 
+NS_IMETHODIMP nsImageListener::OnStopRequest(imgIRequest *aRequest,
+                                             PRBool aLastPart)
+{
+  return NS_OK;
+}
+
 NS_IMETHODIMP nsImageListener::FrameChanged(imgIContainer *aContainer,
                                             gfxIImageFrame *newframe,
                                             nsRect * dirtyRect)