message: Remove unused ConvertBlobToString
diff: @@ -28,13 +28,6 @@ namespace dawn_native { namespace d3d12 {
  namespace {
  - std::string ConvertBlobToString(IDxcBlobEncoding* pBlob) {
  - std::vector<char> infoLog(pBlob->GetBufferSize() + 1);
  - memcpy(infoLog.data(), pBlob->GetBufferPointer(), pBlob->GetBufferSize());
  - infoLog[pBlob->GetBufferSize()] = 0;
  - return std::string(infoLog.data());
  - }
  -
  bool IsValidDXBC(void* buffer) {
  if (buffer == NULL)
  return false;
  