Make CFX_WideString(const CFX_WideString&) 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 62 matching lines @@
   CFX_ByteTextBuf& operator<<(const CFX_ByteTextBuf& buf);
 };
 
 class CFX_WideTextBuf : public CFX_BinaryBuf {
  public:
   void AppendChar(FX_WCHAR wch);
   FX_STRSIZE GetLength() const { return m_DataSize / sizeof(FX_WCHAR); }
   FX_WCHAR* GetBuffer() const {
     return reinterpret_cast<FX_WCHAR*>(m_pBuffer.get());
   }
-  CFX_WideStringC AsStringC() const;
+
+  CFX_WideStringC AsStringC() const {
+    return CFX_WideStringC(reinterpret_cast<const FX_WCHAR*>(m_pBuffer.get()),
+                           m_DataSize / sizeof(FX_WCHAR));
+  }
+  CFX_WideString MakeString() const {
+    return CFX_WideString(reinterpret_cast<const FX_WCHAR*>(m_pBuffer.get()),
+                          m_DataSize / sizeof(FX_WCHAR));
+  }
 
   void Delete(int start_index, int count) {
     CFX_BinaryBuf::Delete(start_index * sizeof(FX_WCHAR),
                           count * sizeof(FX_WCHAR));
   }
 
   CFX_WideTextBuf& operator<<(int i);
   CFX_WideTextBuf& operator<<(double f);
   CFX_WideTextBuf& operator<<(const FX_WCHAR* lpsz);
   CFX_WideTextBuf& operator<<(const CFX_WideStringC& str);
@@ skipping 955 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_