Undeprecate Event.returnValue and Attr.specified

LayoutTests/inspector/console/console-format-expected.txt

 CONSOLE MESSAGE: line 26: test,test2,,,test4,,,,,
 CONSOLE MESSAGE: line 27: %o
 CONSOLE MESSAGE: line 28: %O
 CONSOLE MESSAGE: line 29: Test for zero "%f" in formatter
 CONSOLE MESSAGE: line 12: /^url\(\s*(?:(?:"(?:[^\\\"]|(?:\\[\da-f]{1,6}\s?|\.))*"|'(?:[^\\\']|(?:\\[\da-f]{1,6}\s?|\.))*')|(?:[!#$%&*-~\w]|(?:\\[\da-f]{1,6}\s?|\.))*)\s*\)/i
 CONSOLE MESSAGE: line 13: /^url\(\s*(?:(?:"(?:[^\\\"]|(?:\\[\da-f]{1,6}\s?|\.))*"|'(?:[^\\\']|(?:\\[\da-f]{1,6}\s?|\.))*')|(?:[!#$%&*-~\w]|(?:\\[\da-f]{1,6}\s?|\.))*)\s*\)/i
 CONSOLE MESSAGE: line 12: /foo\\bar\sbaz/i
 CONSOLE MESSAGE: line 13: /foo\\bar\sbaz/i
 CONSOLE MESSAGE: line 12: test
 CONSOLE MESSAGE: line 13: test
@@ skipping 14 matching lines @@
         return 2;
     }
 CONSOLE MESSAGE: line 12: 0.12
 CONSOLE MESSAGE: line 13: 0.12
 CONSOLE MESSAGE: line 12: http://webkit.org/
 CONSOLE MESSAGE: line 13: http://webkit.org/
 CONSOLE MESSAGE: line 12: null
 CONSOLE MESSAGE: line 13: 
 CONSOLE MESSAGE: line 12: undefined
 CONSOLE MESSAGE: line 13: 
-CONSOLE WARNING: Attr.specified is deprecated. Its value is always true.
 CONSOLE MESSAGE: line 12: [object Attr]
 CONSOLE MESSAGE: line 13: [object Attr]
 CONSOLE MESSAGE: line 12: [object Attr]
 CONSOLE MESSAGE: line 13: [object Attr]
 CONSOLE MESSAGE: line 12: [object Attr]
 CONSOLE MESSAGE: line 13: [object Attr]
 CONSOLE MESSAGE: line 12: [object Object]
 CONSOLE MESSAGE: line 13: [object Object]
 CONSOLE MESSAGE: line 12: NaN
 CONSOLE MESSAGE: line 13: NaN
@@ skipping 76 matching lines @@
 globals[10]
 "http://webkit.org/"
 null console-format.html:12
 [null] console-format.html:13
 globals[11]
 null
 undefined console-format.html:12
 [undefined] console-format.html:13
 globals[12]
 undefined
-Attr.specified is deprecated. Its value is always true. VM:437
 attr="" console-format.html:12
 [attr]0: attrlength: 1__proto__: Array[0] console-format.html:13
 globals[13]
 attr=""
 attr="value""value" console-format.html:12
 [attr]0: attrlength: 1__proto__: Array[0] console-format.html:13
 globals[14]
 attr="value""value"
 id="x""x" console-format.html:12
 [id]0: idlength: 1__proto__: Array[0] console-format.html:13
@@ skipping 49 matching lines @@
 Object {}
 function Object() { [native code] } console-format.html:12
 [function]0: function Object() { [native code] }length: 1__proto__: Array[0] console-format.html:13
 globals[28]
 function Object() { [native code] }
 Object {} console-format.html:12
 [Object]0: Objectlength: 1__proto__: Array[0] console-format.html:13
 globals[29]
 Object {}