Issue 5074 - fix tests for "is allowed connection"

src/Utils.h

 /*
  * This file is part of Adblock Plus <https://adblockplus.org/>,
  * Copyright (C) 2006-2017 eyeo GmbH
  *
  * Adblock Plus is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 3 as
  * published by the Free Software Foundation.
  *
  * Adblock Plus is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 30 matching lines @@
       T trimmed(text);
       trimmed.erase(trimmed.begin(), std::find_if(trimmed.begin(), trimmed.end(), std::not1(std::ptr_fun<int, int>(std::isspace))));
       trimmed.erase(std::find_if(trimmed.rbegin(), trimmed.rend(), std::not1(std::ptr_fun<int, int>(std::isspace))).base(), trimmed.end());
       return trimmed;
     }
 #ifdef _WIN32
     std::wstring ToUtf16String(const std::string& str);
     std::string ToUtf8String(const std::wstring& str);
     std::wstring CanonizeUrl(const std::wstring& url);
 #endif
+    inline bool BeginsWith(const std::string& str, const std::string& beginning)
+    {
+      return 0 == str.compare(0, beginning.size(), beginning);
+    }
   }
 }
 
 #endif