96364 - Register html tag observers directly to parser service rather than nsObserverService. Doing so, reduces a lot of overhead. Also, the observers are now notified via sink. This eliminates the need for parser bundle.

r=dp,shanjian,sfraser, sr=rpotts.

parser/htmlparser/robot/nsRobotSink.cpp

@@ -107,6 +107,7 @@ public:
   NS_IMETHOD DidProcessTokens(void) { return NS_OK; }
   NS_IMETHOD WillProcessAToken(void) { return NS_OK; }
   NS_IMETHOD DidProcessAToken(void) { return NS_OK; }
+  NS_IMETHOD NotifyTagObservers(nsIParserNode* aNode) { return NS_OK; }
 
   NS_IMETHOD DoFragment(PRBool aFlag);
   NS_IMETHOD BeginContext(PRInt32 aPosition){ return NS_OK; }