Replaced PassRefPtr copies with moves in unit tests.

third_party/WebKit/Source/platform/PODFreeListArena.h

Index: third_party/WebKit/Source/platform/PODFreeListArena.h
diff --git a/third_party/WebKit/Source/platform/PODFreeListArena.h b/third_party/WebKit/Source/platform/PODFreeListArena.h
index 1c0d5e378d51aa604190544f0e12c056628c3c12..e4446c3c8193bc970d91b1b83f3a1adef7056392 100644
--- a/third_party/WebKit/Source/platform/PODFreeListArena.h
+++ b/third_party/WebKit/Source/platform/PODFreeListArena.h
@@ -42,7 +42,7 @@ class PODFreeListArena : public RefCounted<PODFreeListArena<T>> {
   // Creates a new PODFreeListArena configured with the given Allocator.
   static PassRefPtr<PODFreeListArena> create(
       PassRefPtr<PODArena::Allocator> allocator) {
-    return adoptRef(new PODFreeListArena(allocator));
+    return adoptRef(new PODFreeListArena(std::move(allocator)));
   }
 
   // Allocates an object from the arena.