diff --git a/src/wp-includes/post-template.php b/src/wp-includes/post-template.php
index 701af8de4a..79002ff9ca 100644
--- a/src/wp-includes/post-template.php
+++ b/src/wp-includes/post-template.php
@@ -324,25 +324,9 @@ function get_the_content( $more_link_text = null, $strip_teaser = false ) {
 		}
 	}
 
-	if ( $preview ) // Preview fix for JavaScript bug with foreign languages.
-		$output =	preg_replace_callback( '/\%u([0-9A-F]{4})/', '_convert_urlencoded_to_entities', $output );
-
 	return $output;
 }
 
-/**
- * Preview fix for JavaScript bug with foreign languages.
- *
- * @since 3.1.0
- * @access private
- *
- * @param array $match Match array from preg_replace_callback.
- * @return string
- */
-function _convert_urlencoded_to_entities( $match ) {
-	return '&#' . base_convert( $match[1], 16, 10 ) . ';';
-}
-
 /**
  * Display the post excerpt.
  *
diff --git a/tests/phpunit/data/formatting/utf-8/entitize.py b/tests/phpunit/data/formatting/utf-8/entitize.py
deleted file mode 100644
index efa7cb18d5..0000000000
--- a/tests/phpunit/data/formatting/utf-8/entitize.py
+++ /dev/null
@@ -1,24 +0,0 @@
-# Generates entitized.txt from utf-8.txt
-#
-# entitized.txt is used by Tests_Formatting_UrlEncodedToEntities
-
-import codecs
-import sys
-
-def entitize(line):
-    """Convert text to &#[dec]; entities."""
-    line = line.strip();
-    line = ["&#%d;" % ord(s) for s in line]
-    return "".join(line)
-
-if __name__ == "__main__":
-    args = sys.argv[1:]
-    if args and args[0] in ("-h", "--help"):
-        print "Usage: python entitize.py < utf-8.txt > entitized.txt"
-        sys.exit(2)
-
-    sys.stdin = codecs.getreader("utf-8")(sys.stdin)
-    sys.stdout = codecs.getwriter("ascii")(sys.stdout)    
-    
-    lines = sys.stdin.readlines()
-    sys.stdout.write( "\n".join(map(entitize, lines)) )
diff --git a/tests/phpunit/data/formatting/utf-8/entitized.txt b/tests/phpunit/data/formatting/utf-8/entitized.txt
deleted file mode 100644
index 93d897585f..0000000000
--- a/tests/phpunit/data/formatting/utf-8/entitized.txt
+++ /dev/null
@@ -1,6 +0,0 @@
-&#31456;&#23376;&#24609;
-&#70;&#114;&#97;&#110;&#231;&#111;&#105;&#115;&#32;&#84;&#114;&#117;&#102;&#102;&#97;&#117;&#116;
-&#4321;&#4304;&#4325;&#4304;&#4320;&#4311;&#4309;&#4308;&#4314;&#4317;
-&#66;&#106;&#246;&#114;&#107;&#32;&#71;&#117;&#240;&#109;&#117;&#110;&#100;&#115;&#100;&#243;&#116;&#116;&#105;&#114;
-&#23470;&#23822;&#12288;&#39423;
-&#128077;
\ No newline at end of file
diff --git a/tests/phpunit/data/formatting/utf-8/u-urlencode.py b/tests/phpunit/data/formatting/utf-8/u-urlencode.py
deleted file mode 100644
index c20a14f1f8..0000000000
--- a/tests/phpunit/data/formatting/utf-8/u-urlencode.py
+++ /dev/null
@@ -1,24 +0,0 @@
-# Generates u-urlencoded.txt from utf-8.txt
-#
-# u-urlencoded.txt is used by Tests_Formatting_UrlEncodedToEntities
-
-import codecs
-import sys
-
-def uurlencode(line):
-    """Use %u[hexvalue] percent encoding."""
-    line = line.strip()
-    line = ["%%u%04X" % ord(s) for s in line]
-    return "".join(line)
-
-if __name__ == "__main__":
-    args = sys.argv[1:]
-    if args and args[0] in ("-h", "--help"):
-        print "Usage: python u-urlencode.py < utf-8.txt > u-urlencoded.txt"
-        sys.exit(2)
-
-    sys.stdin = codecs.getreader("utf-8")(sys.stdin)
-    sys.stdout = codecs.getwriter("ascii")(sys.stdout)    
-    
-    lines = sys.stdin.readlines()
-    sys.stdout.write( "\n".join(map(uurlencode, lines)) )
diff --git a/tests/phpunit/data/formatting/utf-8/u-urlencoded.txt b/tests/phpunit/data/formatting/utf-8/u-urlencoded.txt
deleted file mode 100644
index d6f77fdc3f..0000000000
--- a/tests/phpunit/data/formatting/utf-8/u-urlencoded.txt
+++ /dev/null
@@ -1,6 +0,0 @@
-%u7AE0%u5B50%u6021
-%u0046%u0072%u0061%u006E%u00E7%u006F%u0069%u0073%u0020%u0054%u0072%u0075%u0066%u0066%u0061%u0075%u0074
-%u10E1%u10D0%u10E5%u10D0%u10E0%u10D7%u10D5%u10D4%u10DA%u10DD
-%u0042%u006A%u00F6%u0072%u006B%u0020%u0047%u0075%u00F0%u006D%u0075%u006E%u0064%u0073%u0064%u00F3%u0074%u0074%u0069%u0072
-%u5BAE%u5D0E%u3000%u99FF
-%u1F44D
\ No newline at end of file
diff --git a/tests/phpunit/tests/formatting/UrlEncodedToEntities.php b/tests/phpunit/tests/formatting/UrlEncodedToEntities.php
deleted file mode 100644
index e680352725..0000000000
--- a/tests/phpunit/tests/formatting/UrlEncodedToEntities.php
+++ /dev/null
@@ -1,24 +0,0 @@
-<?php
-
-/**
- * @group formatting
- */
-class Tests_Formatting_UrlEncodedToEntities extends WP_UnitTestCase {
-	/**
-	 * @dataProvider data
-	 */
-	function test_convert_urlencoded_to_entities( $u_urlencoded, $entity ) {
-		$this->assertEquals( $entity, preg_replace_callback('/\%u([0-9A-F]{4,5})/', '_convert_urlencoded_to_entities', $u_urlencoded ), $entity );
-	}
-
-	function data() {
-		$input  = file( DIR_TESTDATA . '/formatting/utf-8/u-urlencoded.txt' );
-		$output = file( DIR_TESTDATA . '/formatting/utf-8/entitized.txt' );
-		$data_provided = array();
-		foreach ( $input as $key => $value ) {
-			$data_provided[] = array( trim( $value ), trim( $output[ $key ] ) );
-		}
-		return $data_provided;
-	}
-}
-