Revert^2 "Move some image/9patch code to androidfw"

This reverts commit 917043bc2586743afda5a21386893fa8c787800b.

Reason for revert: Roll forward with fix

Test: Automatic
Bug: 296324826
Change-Id: I42a0b48c02fd497b2174c0c65f300265202f7ab1
diff --git a/tools/aapt2/io/FileSystem.h b/tools/aapt2/io/FileSystem.h
index f975196..d6ecfeb 100644
--- a/tools/aapt2/io/FileSystem.h
+++ b/tools/aapt2/io/FileSystem.h
@@ -30,7 +30,7 @@
   explicit RegularFile(const android::Source& source);
 
   std::unique_ptr<IData> OpenAsData() override;
-  std::unique_ptr<io::InputStream> OpenInputStream() override;
+  std::unique_ptr<android::InputStream> OpenInputStream() override;
   const android::Source& GetSource() const override;
   bool GetModificationTime(struct tm* buf) const override;