Oilpan: move ClientRect and its list to the oilpan heap.

Source/core/dom/ClientRect.idl

 /*
  * Copyright (C) 2009 Apple Inc. All Rights Reserved.
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  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
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 [
+    WillBeGarbageCollected,
 ] interface ClientRect {
     readonly attribute float top;
     readonly attribute float right;
     readonly attribute float bottom;
     readonly attribute float left;
     readonly attribute float width;
     readonly attribute float height;
 };