Restore PendingScript prefinalizer.

third_party/WebKit/Source/core/dom/PendingScript.h

Index: third_party/WebKit/Source/core/dom/PendingScript.h
diff --git a/third_party/WebKit/Source/core/dom/PendingScript.h b/third_party/WebKit/Source/core/dom/PendingScript.h
index 25abb4186100c8839511c0f07a0c111103354d5b..66a9d9d9d3a8ff5ef667b93835f805a1cb14d737 100644
--- a/third_party/WebKit/Source/core/dom/PendingScript.h
+++ b/third_party/WebKit/Source/core/dom/PendingScript.h
@@ -47,6 +47,7 @@ class ScriptSourceCode;
 // lifetime in order to guarantee that the data buffer will not be purged.
 class CORE_EXPORT PendingScript final : public GarbageCollectedFinalized<PendingScript>, public ResourceOwner<ScriptResource> {
     USING_GARBAGE_COLLECTED_MIXIN(PendingScript);
+    USING_PRE_FINALIZER(PendingScript, dispose);
     WTF_MAKE_NONCOPYABLE(PendingScript);
 public:
     static PendingScript* create(Element*, ScriptResource*);