Make CFX_ByteString(const CFX_ByteStringC&) explicit.

core/fxcrt/include/fx_basic.h

 // Copyright 2014 PDFium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
 
 #ifndef CORE_FXCRT_INCLUDE_FX_BASIC_H_
 #define CORE_FXCRT_INCLUDE_FX_BASIC_H_
 
 #include <algorithm>
@@ skipping 38 matching lines @@
   void ExpandBuf(FX_STRSIZE size);
 
   FX_STRSIZE m_AllocStep;
   FX_STRSIZE m_AllocSize;
   FX_STRSIZE m_DataSize;
   std::unique_ptr<uint8_t, FxFreeDeleter> m_pBuffer;
 };
 
 class CFX_ByteTextBuf : public CFX_BinaryBuf {
  public:
-  void AppendChar(int ch) { AppendByte((uint8_t)ch); }
   FX_STRSIZE GetLength() const { return m_DataSize; }
-  CFX_ByteStringC AsStringC() const;
+  CFX_ByteString MakeString() const {
+    return CFX_ByteString(m_pBuffer.get(), m_DataSize);
+  }
+  CFX_ByteStringC AsStringC() const {
+    return CFX_ByteStringC(m_pBuffer.get(), m_DataSize);
+  }
 
+  void AppendChar(int ch) { AppendByte(static_cast<uint8_t>(ch)); }
   CFX_ByteTextBuf& operator<<(int i);
   CFX_ByteTextBuf& operator<<(uint32_t i);
   CFX_ByteTextBuf& operator<<(double f);
   CFX_ByteTextBuf& operator<<(const FX_CHAR* pStr) {
     return *this << CFX_ByteStringC(pStr);
   }
   CFX_ByteTextBuf& operator<<(const CFX_ByteString& str) {
     return *this << str.AsStringC();
   }
   CFX_ByteTextBuf& operator<<(const CFX_ByteStringC& lpsz);
@@ skipping 976 matching lines @@
   FX_FLOAT c;
   FX_FLOAT d;
   FX_FLOAT e;
   FX_FLOAT f;
   FX_FLOAT g;
   FX_FLOAT h;
   FX_FLOAT i;
 };
 
 #endif  // CORE_FXCRT_INCLUDE_FX_BASIC_H_