* lib/net/http.rb: come back autoload. OpenSSL constant is used

some places, so it leads mistakes like HTTP.start.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@32899 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,8 @@
+Wed Aug 10 02:53:27 2011  NARUSE, Yui  <naruse@ruby-lang.org>
+
+	* lib/net/http.rb: come back autoload. OpenSSL constant is used
+	  some places, so it leads mistakes like HTTP.start.
+
 Tue Aug  9 22:57:45 2011  CHIKANAGA Tomoyuki  <nagachika00@gmail.com>
 
 	* ext/date/date_parse.c (date_zone_to_diff): add RB_GC_GUARD.

lib/net/http.rb

@@ -21,6 +21,7 @@
 
 require 'net/protocol'
 require 'uri'
+autoload :OpenSSL, 'openssl'
 
 module Net   #:nodoc:
 
@@ -666,12 +667,7 @@ module Net   #:nodoc:
     # If you change use_ssl value after session started,
     # a Net::HTTP object raises IOError.
     def use_ssl=(flag)
-      flag = if flag
-        require 'openssl' unless defined?(OpenSSL)
-        true
-      else
-        false
-      end
+      flag = flag ? true : false
       if started? and @use_ssl != flag
         raise IOError, "use_ssl value changed, but session already started"
       end