Re-enable MSVC warning 4800 for compiling with chromium_code

fpdfsdk/src/fpdfsave.cpp

Index: fpdfsdk/src/fpdfsave.cpp
diff --git a/fpdfsdk/src/fpdfsave.cpp b/fpdfsdk/src/fpdfsave.cpp
index 1aa1651e4774d7c53ab60b67829d6edcd5536e3f..81defbf0a75e48873b0e3887204f7b49f193014b 100644
--- a/fpdfsdk/src/fpdfsave.cpp
+++ b/fpdfsdk/src/fpdfsave.cpp
@@ -302,10 +302,9 @@ bool FPDF_Doc_Save(FPDF_DOCUMENT document,
   }
 
   CFX_IFileWrite* pStreamWrite = NULL;
-  FX_BOOL bRet;
   pStreamWrite = new CFX_IFileWrite;
   pStreamWrite->Init(pFileWrite);
-  bRet = FileMaker.Create(pStreamWrite, flags);
+  bool bRet = FileMaker.Create(pStreamWrite, flags);
 #ifdef PDF_ENABLE_XFA
   SendPostSaveToXFADoc(pDoc);
 #endif  // PDF_ENABLE_XFA