[Oilpan] Migrate classes under module/webgl onto oilpan heap

Source/modules/webgl/WebGLContextGroup.h

Index: Source/modules/webgl/WebGLContextGroup.h
diff --git a/Source/modules/webgl/WebGLContextGroup.h b/Source/modules/webgl/WebGLContextGroup.h
index e5e6c8cd5e1d93a0f3eb77c9eaf1c852af05a925..d40950ba4001b6f33c3c56e86b14ce1fe303c5b9 100644
--- a/Source/modules/webgl/WebGLContextGroup.h
+++ b/Source/modules/webgl/WebGLContextGroup.h
@@ -71,7 +71,7 @@ private:
     // WebGLContextGroup takes care of detaching the group objects if
     // the set of WebGLRenderingContextBase contexts becomes empty.
     HashSet<WebGLRenderingContextBase*> m_contexts;
-    HashSet<WebGLSharedObject*> m_groupObjects;
+    PersistentHeapHashSet<WeakMember<WebGLSharedObject>> m_groupObjects;

[haraken, 2015/08/04 00:06:52]

It looks harmless to make these raw pointers weak, but the handling of the raw
pointers are complicated. Let's keep them as raw pointers in this CL and address
them in a follow-up CL.

[Ken Russell (switch to Gerrit), 2015/08/04 00:34:10]

+1 for keeping the behavioral changes as simple as possible in this CL.
Appreciate your continued work on this after this CL lands.

[peria, 2015/08/04 09:10:25]

Done.

 };
 
 } // namespace blink