Make CFX_ByteString(const CFX_ByteStringC&) explicit.

core/fxge/include/fx_font.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_FXGE_INCLUDE_FX_FONT_H_
 #define CORE_FXGE_INCLUDE_FX_FONT_H_
 
 #include <map>
@@ skipping 483 matching lines @@
                                const CFX_Matrix* pMatrix,
                                int dest_width,
                                int anti_alias);
   CFX_GlyphBitmap* RenderGlyph_Nativetext(CFX_Font* pFont,
                                           uint32_t glyph_index,
                                           const CFX_Matrix* pMatrix,
                                           int dest_width,
                                           int anti_alias);
   CFX_GlyphBitmap* LookUpGlyphBitmap(CFX_Font* pFont,
                                      const CFX_Matrix* pMatrix,
-                                     CFX_ByteStringC& FaceGlyphsKey,
+                                     const CFX_ByteString& FaceGlyphsKey,
                                      uint32_t glyph_index,
                                      FX_BOOL bFontStyle,
                                      int dest_width,
                                      int anti_alias);
   void InitPlatform();
   void DestroyPlatform();
 
   FXFT_Face const m_Face;
   std::map<CFX_ByteString, CFX_SizeGlyphCache*> m_SizeMap;
   std::map<uint32_t, CFX_PathData*> m_PathMap;
@@ skipping 17 matching lines @@
                            FX_FLOAT retinaScaleX = 1.0f,
                            FX_FLOAT retinaScaleY = 1.0f);
 
 CFX_ByteString GetNameFromTT(const uint8_t* name_table,
                              uint32_t name_table_size,
                              uint32_t name);
 
 int PDF_GetStandardFontName(CFX_ByteString* name);
 
 #endif  // CORE_FXGE_INCLUDE_FX_FONT_H_