Mojo: Support enums as map keys in WTF

mojo/public/cpp/bindings/struct_ptr.h

Index: mojo/public/cpp/bindings/struct_ptr.h
diff --git a/mojo/public/cpp/bindings/struct_ptr.h b/mojo/public/cpp/bindings/struct_ptr.h
index a01c42f9d05e689ba3e193242b254cdeebed9fe6..b135312e3944f52e458852ebd4372c1df903bca5 100644
--- a/mojo/public/cpp/bindings/struct_ptr.h
+++ b/mojo/public/cpp/bindings/struct_ptr.h
@@ -228,7 +228,7 @@ template <typename Struct>
 class StructPtrWTFHelper {
  public:
   static bool IsHashTableDeletedValue(const StructPtr<Struct>& value) {
-    return value.ptr_ == reinterpret_cast<Struct*>(1u);
+    return value.ptr_.get() == reinterpret_cast<Struct*>(1u);
   }
 
   static void ConstructDeletedValue(mojo::StructPtr<Struct>& slot) {
@@ -239,7 +239,7 @@ class StructPtrWTFHelper {
     // Dirty trick: implant an invalid pointer in |ptr_|. Destructor isn't
     // called for deleted buckets, so this is okay.
     new (&slot) StructPtr<Struct>();
-    slot.ptr_ = reinterpret_cast<Struct*>(1u);
+    slot.ptr_.reset(reinterpret_cast<Struct*>(1u));
   }
 };