Move some methods into 1.8.x-only proxy. [#4978 state:resolved]

These methods had been overridden because they had bugs on 1.9.1.  Since
Rails now supports only 1.9.2, and these methods now work properly on
that version, there's no longer any need to override them.
Signed-off-by: NJosé Valim <jose.valim@gmail.com>

activesupport/lib/active_support/multibyte/chars.rb

@@ -195,6 +195,45 @@ def ord
           Unicode.u_unpack(@wrapped_string)[0]
         end
 
+        # Works just like <tt>String#rjust</tt>, only integer specifies characters instead of bytes.
+        #
+        # Example:
+        #
+        #   "¾ cup".mb_chars.rjust(8).to_s
+        #   #=> "   ¾ cup"
+        #
+        #   "¾ cup".mb_chars.rjust(8, " ").to_s # Use non-breaking whitespace
+        #   #=> "   ¾ cup"
+        def rjust(integer, padstr=' ')
+          justify(integer, :right, padstr)
+        end
+
+        # Works just like <tt>String#ljust</tt>, only integer specifies characters instead of bytes.
+        #
+        # Example:
+        #
+        #   "¾ cup".mb_chars.rjust(8).to_s
+        #   #=> "¾ cup   "
+        #
+        #   "¾ cup".mb_chars.rjust(8, " ").to_s # Use non-breaking whitespace
+        #   #=> "¾ cup   "
+        def ljust(integer, padstr=' ')
+          justify(integer, :left, padstr)
+        end
+
+        # Works just like <tt>String#center</tt>, only integer specifies characters instead of bytes.
+        #
+        # Example:
+        #
+        #   "¾ cup".mb_chars.center(8).to_s
+        #   #=> " ¾ cup  "
+        #
+        #   "¾ cup".mb_chars.center(8, " ").to_s # Use non-breaking whitespace
+        #   #=> " ¾ cup  "
+        def center(integer, padstr=' ')
+          justify(integer, :center, padstr)
+        end
+
       else
         def =~(other)
           @wrapped_string =~ other
@@ -250,46 +289,6 @@ def []=(*args)
         end
       end
 
-      # Works just like <tt>String#rjust</tt>, only integer specifies characters instead of bytes.
-      #
-      # Example:
-      #
-      #   "¾ cup".mb_chars.rjust(8).to_s
-      #   #=> "   ¾ cup"
-      #
-      #   "¾ cup".mb_chars.rjust(8, " ").to_s # Use non-breaking whitespace
-      #   #=> "   ¾ cup"
-      def rjust(integer, padstr=' ')
-        justify(integer, :right, padstr)
-      end
-
-      # Works just like <tt>String#ljust</tt>, only integer specifies characters instead of bytes.
-      #
-      # Example:
-      #
-      #   "¾ cup".mb_chars.rjust(8).to_s
-      #   #=> "¾ cup   "
-      #
-      #   "¾ cup".mb_chars.rjust(8, " ").to_s # Use non-breaking whitespace
-      #   #=> "¾ cup   "
-      def ljust(integer, padstr=' ')
-        justify(integer, :left, padstr)
-      end
-
-      # Works just like <tt>String#center</tt>, only integer specifies characters instead of bytes.
-      #
-      # Example:
-      #
-      #   "¾ cup".mb_chars.center(8).to_s
-      #   #=> " ¾ cup  "
-      #
-      #   "¾ cup".mb_chars.center(8, " ").to_s # Use non-breaking whitespace
-      #   #=> " ¾ cup  "
-      def center(integer, padstr=' ')
-        justify(integer, :center, padstr)
-      end
-
-
       # Reverses all characters in the string.
       #
       # Example: