Revert of Refactor Script(Loader|Runner): don't access Resources all over the place...

Source/core/dom/PendingScript.cpp

Index: Source/core/dom/PendingScript.cpp
diff --git a/Source/core/dom/PendingScript.cpp b/Source/core/dom/PendingScript.cpp
index a3601a960d17c1cecec68ce2bb2e77bf44715148..143e6680b7c9f92eb4a9087fd54e9b2a75240e34 100644
--- a/Source/core/dom/PendingScript.cpp
+++ b/Source/core/dom/PendingScript.cpp
@@ -40,12 +40,13 @@
 void PendingScript::watchForLoad(ScriptResourceClient* client)
 {
     ASSERT(!m_watchingForLoad);
-    // addClient() will call notifyFinished() if the load is complete. Callers
-    // who do not expect to be re-entered from this call should not call
-    // watchForLoad for a PendingScript which isReady.
+    ASSERT(!isReady());
     if (m_streamer) {
         m_streamer->addClient(client);
     } else {
+        // addClient() will call notifyFinished() if the load is
+        // complete. Callers do not expect to be re-entered from this call, so
+        // they should not become a client of an already-loaded Resource.
         resource()->addClient(client);
     }
     m_watchingForLoad = true;