Move fxcrt::{Byte,Wide}Strings with std::move().chromium/3466

Remove some string copies in barcode that were noticed whilst
looking for moves.

Change-Id: Ieda34d00f633576ba1f0dca283dcdabfb36f236c
Reviewed-on: https://pdfium-review.googlesource.com/35410
Reviewed-by: dsinclair <dsinclair@chromium.org>
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Commit-Queue: Tom Sepez <tsepez@chromium.org>

1 files changed, 3 insertions, 1 deletions

diff --git a/fxbarcode/datamatrix/BC_EncoderContext.cpp b/fxbarcode/datamatrix/BC_EncoderContext.cpp
index f5c2f4c1fc..e72d1e4640 100644
--- a/fxbarcode/datamatrix/BC_EncoderContext.cpp
+++ b/fxbarcode/datamatrix/BC_EncoderContext.cpp
@@ -22,6 +22,8 @@
 
 #include "fxbarcode/datamatrix/BC_EncoderContext.h"
 
+#include <utility>
+
 #include "fxbarcode/BC_UtilCodingConvert.h"
 #include "fxbarcode/common/BC_CommonBitMatrix.h"
 #include "fxbarcode/datamatrix/BC_Encoder.h"
@@ -43,7 +45,7 @@ CBC_EncoderContext::CBC_EncoderContext(const WideString& msg,
     }
     sb += ch;
   }
-  m_msg = sb;
+  m_msg = std::move(sb);
   m_codewords.Reserve(m_msg.GetLength());
   m_allowRectangular = true;
   m_newEncoding = -1;