Remove Cask’s which method.

Library/Homebrew/cask/lib/hbc/cli.rb

@@ -107,7 +107,7 @@ module Hbc
       if command.respond_to?(:run)
         # usual case: built-in command verb
         command.run(*rest)
-      elsif require? Utils.which("brewcask-#{command}.rb").to_s
+      elsif require? which("brewcask-#{command}.rb").to_s
         # external command as Ruby library on PATH, Homebrew-style
       elsif command.to_s.include?("/") && require?(command.to_s)
         # external command as Ruby library with literal path, useful
@@ -124,7 +124,7 @@ module Hbc
           # other Ruby libraries must do everything via "require"
           klass.run(*rest)
         end
-      elsif Utils.which "brewcask-#{command}"
+      elsif which("brewcask-#{command}")
         # arbitrary external executable on PATH, Homebrew-style
         exec "brewcask-#{command}", *ARGV[1..-1]
       elsif Pathname.new(command.to_s).executable? &&

Library/Homebrew/cask/lib/hbc/utils.rb

@@ -38,34 +38,6 @@ end
 
 module Hbc
   module Utils
-    def self.which(cmd, path = ENV["PATH"])
-      unless File.basename(cmd) == cmd.to_s
-        # cmd contains a directory element
-        cmd_pn = Pathname(cmd)
-        return nil unless cmd_pn.absolute?
-        return resolve_executable(cmd_pn)
-      end
-      path.split(File::PATH_SEPARATOR).each do |elt|
-        fq_cmd = Pathname(elt).expand_path.join(cmd)
-        resolved = resolve_executable fq_cmd
-        return resolved if resolved
-      end
-      nil
-    end
-
-    def self.resolve_executable(cmd)
-      cmd_pn = Pathname(cmd)
-      return nil unless cmd_pn.exist?
-      return nil unless cmd_pn.executable?
-      begin
-        cmd_pn = Pathname(cmd_pn.realpath)
-      rescue RuntimeError
-        return nil
-      end
-      return nil unless cmd_pn.file?
-      cmd_pn
-    end
-
     def self.gain_permissions_remove(path, command: SystemCommand)
       if path.respond_to?(:rmtree) && path.exist?
         gain_permissions(path, ["-R"], command, &:rmtree)