Remove FieldHelper.

Change-Id: I2d74e2d5b3c35a691c95339de0db9361847fca11
diff --git a/runtime/mirror/art_field.h b/runtime/mirror/art_field.h
index 50299b6..a1d8844 100644
--- a/runtime/mirror/art_field.h
+++ b/runtime/mirror/art_field.h
@@ -161,6 +161,8 @@
 
   bool IsPrimitiveType() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
 
+  Class* GetType(bool resolve) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
+
   size_t FieldSize() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
 
   mirror::DexCache* GetDexCache() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);