Remove unused WidenString function

src/common/string_utils.cpp

@@ -157,27 +157,6 @@ bool ReadFileToString(const std::string &path, std::string *stringOut)
     return !inFile.fail();
 }
 
-Optional<std::vector<wchar_t>> WidenString(size_t length, const char *cString)
-{
-    std::vector<wchar_t> wcstring(length + 1);
-#if !defined(ANGLE_PLATFORM_WINDOWS)
-    mbstate_t mbstate = {};
-    size_t written    = mbsrtowcs(wcstring.data(), &cString, length + 1, &mbstate);
-    if (written == 0)
-    {
-        return Optional<std::vector<wchar_t>>::Invalid();
-    }
-#else
-    size_t convertedChars = 0;
-    errno_t err = mbstowcs_s(&convertedChars, wcstring.data(), length + 1, cString, _TRUNCATE);
-    if (err != 0)
-    {
-        return Optional<std::vector<wchar_t>>::Invalid();
-    }
-#endif
-    return Optional<std::vector<wchar_t>>(wcstring);
-}
-
 bool BeginsWith(const std::string &str, const std::string &prefix)
 {
     return strncmp(str.c_str(), prefix.c_str(), prefix.length()) == 0;

src/common/string_utils.h

@@ -49,8 +49,6 @@ bool HexStringToUInt(const std::string &input, unsigned int *uintOut);
 
 bool ReadFileToString(const std::string &path, std::string *stringOut);
 
-Optional<std::vector<wchar_t>> WidenString(size_t length, const char *cString);
-
 // Check if the string str begins with the given prefix.
 // The comparison is case sensitive.
 bool BeginsWith(const std::string &str, const std::string &prefix);