Move StringPool to libandroidfw

Test: verified affected tests pass
Bug: 232940948
Change-Id: I22089893d7e5013f759c39ce190bec07fa6435db
diff --git a/tools/aapt2/io/FileSystem.h b/tools/aapt2/io/FileSystem.h
index 04c6fa1..bc03b9b 100644
--- a/tools/aapt2/io/FileSystem.h
+++ b/tools/aapt2/io/FileSystem.h
@@ -27,16 +27,16 @@
 // A regular file from the file system. Uses mmap to open the data.
 class RegularFile : public IFile {
  public:
-  explicit RegularFile(const Source& source);
+  explicit RegularFile(const android::Source& source);
 
   std::unique_ptr<IData> OpenAsData() override;
   std::unique_ptr<io::InputStream> OpenInputStream() override;
-  const Source& GetSource() const override;
+  const android::Source& GetSource() const override;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(RegularFile);
 
-  Source source_;
+  android::Source source_;
 };
 
 class FileCollection;