Replace RenderArena with PartitionAlloc.

Source/core/rendering/InlineIterator.h

Index: Source/core/rendering/InlineIterator.h
diff --git a/Source/core/rendering/InlineIterator.h b/Source/core/rendering/InlineIterator.h
index 17e219388cb35eb72dcd8e68373cc7a733ec5b0c..f56bb0cd6840dce14b070f7cb062a060c3838d74 100644
--- a/Source/core/rendering/InlineIterator.h
+++ b/Source/core/rendering/InlineIterator.h
@@ -444,7 +444,7 @@ static inline unsigned numberOfIsolateAncestors(const InlineIterator& iter)
 static inline void addPlaceholderRunForIsolatedInline(InlineBidiResolver& resolver, RenderObject* obj, unsigned pos)
 {
     ASSERT(obj);
-    BidiRun* isolatedRun = new (obj->renderArena()) BidiRun(pos, 0, obj, resolver.context(), resolver.dir());
+    BidiRun* isolatedRun = new BidiRun(pos, 0, obj, resolver.context(), resolver.dir());
     resolver.runs().addRun(isolatedRun);
     // FIXME: isolatedRuns() could be a hash of object->run and then we could cheaply
     // ASSERT here that we didn't create multiple objects for the same inline.