Remove const-ref retained stream arguments, step 2.

Change-Id: Ie98e2c0cd8b239ba0660676e2717807f30b01607
Reviewed-on: https://pdfium-review.googlesource.com/c/pdfium/+/100351
Reviewed-by: Lei Zhang <thestig@chromium.org>
Commit-Queue: Tom Sepez <tsepez@chromium.org>
diff --git a/core/fpdfapi/parser/cpdf_syntax_parser.cpp b/core/fpdfapi/parser/cpdf_syntax_parser.cpp
index 2910651..657bdee 100644
--- a/core/fpdfapi/parser/cpdf_syntax_parser.cpp
+++ b/core/fpdfapi/parser/cpdf_syntax_parser.cpp
@@ -44,10 +44,10 @@
 
 class ReadableSubStream final : public IFX_SeekableReadStream {
  public:
-  ReadableSubStream(const RetainPtr<IFX_SeekableReadStream>& pFileRead,
+  ReadableSubStream(RetainPtr<IFX_SeekableReadStream> pFileRead,
                     FX_FILESIZE part_offset,
                     FX_FILESIZE part_size)
-      : m_pFileRead(pFileRead),
+      : m_pFileRead(std::move(pFileRead)),
         m_PartOffset(part_offset),
         m_PartSize(part_size) {}