Fixes 89191. r=gagan, av, peterl.

modules/plugin/base/src/nsPluginHostImpl.cpp

@@ -2065,6 +2065,22 @@ nsresult nsPluginStreamListenerPeer::SetUpStreamListener(nsIRequest *request,
 
   mPluginStreamInfo->SetSeekable(bSeekable);
  
+  PRUint32 length = -1;
+  mPluginStreamInfo->GetLength(&length);
+  if (bSeekable && length == -1 && httpChannel) {
+    nsXPIDLCString tmp;
+	httpChannel->GetResponseHeader("Content-Length", getter_Copies(tmp));
+    if (tmp.get()) {
+        PRInt32 ignore;
+        nsCString lenString (tmp.get());
+    	length = lenString.ToInteger(&ignore);
+    	mPluginStreamInfo->SetLength(length);
+    }
+  }
+  if (length == -1)
+	mPluginStreamInfo->SetSeekable(PR_FALSE);
+
+	  // we require a content len
   // get Last-Modified header for plugin info
   if (httpChannel) 
   {

modules/plugin/nglsrc/nsPluginHostImpl.cpp

@@ -2065,6 +2065,22 @@ nsresult nsPluginStreamListenerPeer::SetUpStreamListener(nsIRequest *request,
 
   mPluginStreamInfo->SetSeekable(bSeekable);
  
+  PRUint32 length = -1;
+  mPluginStreamInfo->GetLength(&length);
+  if (bSeekable && length == -1 && httpChannel) {
+    nsXPIDLCString tmp;
+	httpChannel->GetResponseHeader("Content-Length", getter_Copies(tmp));
+    if (tmp.get()) {
+        PRInt32 ignore;
+        nsCString lenString (tmp.get());
+    	length = lenString.ToInteger(&ignore);
+    	mPluginStreamInfo->SetLength(length);
+    }
+  }
+  if (length == -1)
+	mPluginStreamInfo->SetSeekable(PR_FALSE);
+
+	  // we require a content len
   // get Last-Modified header for plugin info
   if (httpChannel) 
   {

netwerk/protocol/http/src/nsHttpTransaction.cpp

@@ -434,8 +434,12 @@ nsHttpTransaction::HandleContentStart()
             // eliminate any references to this content length value, so our
             // consumers don't get confused.
             mContentLength = -1;
-            mResponseHead->SetHeader(nsHttp::Content_Length, nsnull);
             mResponseHead->SetContentLength(-1);
+            // if a client is really interested in the content length,
+            // even though we think it is invalid, them them hut for it
+            // in the raw headers.
+            //          mResponseHead->SetHeader(nsHttp::Content_Length, nsnull);
+
         }
     }