Remove unimplemented and unused IsSchemeBitSet method

The IsSchemeBitSet method was added in https://chromiumcodereview.appspot.com/12792005/#ps4001,
but removed during a refactor within the same CL. It was never used, so it can be removed.

Review URL: https://codereview.chromium.org/233293004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@263091 0039d316-1c4b-4281-b951-d872f2087c98

extensions/common/url_pattern.h

@@ -189,9 +189,6 @@ class URLPattern {
   // Get an error string for a ParseResult.
   static const char* GetParseResultString(URLPattern::ParseResult parse_result);
 
-  // Checks whether the bit is set for the given scheme in the given scheme mask
-  static bool IsSchemeBitSet(const std::string& scheme, const int mask);
-
  private:
   // Returns true if any of the |schemes| items matches our scheme.
   bool MatchesAnyScheme(const std::vector<std::string>& schemes) const;