Move StringPool to libandroidfw

Test: verified affected tests pass
Bug: 232940948
Change-Id: I22089893d7e5013f759c39ce190bec07fa6435db
diff --git a/tools/aapt2/test/Builders.h b/tools/aapt2/test/Builders.h
index 55778ae..780bd0d 100644
--- a/tools/aapt2/test/Builders.h
+++ b/tools/aapt2/test/Builders.h
@@ -75,7 +75,7 @@
                                        const OverlayableItem& overlayable);
   ResourceTableBuilder& Add(NewResource&& res);
 
-  StringPool* string_pool();
+  android::StringPool* string_pool();
   std::unique_ptr<ResourceTable> Build();
 
  private:
@@ -97,7 +97,7 @@
 
   template <typename... Args>
   ValueBuilder& SetSource(Args&&... args) {
-    value_->SetSource(Source{std::forward<Args>(args)...});
+    value_->SetSource(android::Source{std::forward<Args>(args)...});
     return *this;
   }