Use class methods of File over Kernel.open and IO.read

Author: nobu

lib/webrick/httputils.rb

@@ -123,7 +123,7 @@ def normalize_path(path)
     def load_mime_types(file)
       # note: +file+ may be a "| command" for now; some people may
       # rely on this, but currently we do not use this method by default.
-      open(file){ |io|
+      File.open(file){ |io|
         hash = Hash.new
         io.each{ |line|
           next if /^#/ =~ line

test/webrick/test_filehandler.rb

@@ -85,12 +85,12 @@ def test_make_partial_content
           "Content-Type: text/plain\r\n" \
           "Content-Range: bytes 0-0/#{filesize}\r\n" \
           "\r\n" \
-          "#{IO.read(__FILE__, 1)}\r\n" \
+          "#{File.read(__FILE__, 1)}\r\n" \
           "--#{boundary}\r\n" \
           "Content-Type: text/plain\r\n" \
           "Content-Range: bytes #{off}-#{last}/#{filesize}\r\n" \
           "\r\n" \
-          "#{IO.read(__FILE__, 2, off)}\r\n" \
+          "#{File.read(__FILE__, 2, off)}\r\n" \
           "--#{boundary}--\r\n"
     assert_equal exp, body
   end

test/webrick/test_httprequest.rb

@@ -245,7 +245,7 @@ def test_chunked
 
     _end_of_message_
     msg.gsub!(/^ {6}/, "")
-    open(__FILE__){|io|
+    File.open(__FILE__){|io|
       while chunk = io.read(100)
         msg << chunk.size.to_s(16) << crlf
         msg << chunk << crlf