Rename GetCStr and GetPtr to match CFX_ByteString

core/fxcrt/fxcrt_windows.cpp

Index: core/fxcrt/fxcrt_windows.cpp
diff --git a/core/fxcrt/fxcrt_windows.cpp b/core/fxcrt/fxcrt_windows.cpp
index 340d22585f64fb6aaf6c7913182b857da438e258..9b232cdf024ad00fc7e16f4a9212ddfc8e4a8d49 100644
--- a/core/fxcrt/fxcrt_windows.cpp
+++ b/core/fxcrt/fxcrt_windows.cpp
@@ -47,8 +47,8 @@ FX_BOOL CFXCRT_FileAccess_Win64::Open(const CFX_ByteStringC& fileName,
   }
   uint32_t dwAccess, dwShare, dwCreation;
   FXCRT_Windows_GetFileMode(dwMode, dwAccess, dwShare, dwCreation);
-  m_hFile = ::CreateFileA(fileName.GetCStr(), dwAccess, dwShare, NULL,
-                          dwCreation, FILE_ATTRIBUTE_NORMAL, NULL);
+  m_hFile = ::CreateFileA(fileName.c_str(), dwAccess, dwShare, NULL, dwCreation,
+                          FILE_ATTRIBUTE_NORMAL, NULL);
   if (m_hFile == INVALID_HANDLE_VALUE) {
     m_hFile = NULL;
   }