Remove MicroData implementation

LayoutTests/fast/dom/MicroData/itemvalue-returns-null-expected.txt

-This tests that itemValue must be null if the element does not have an itemprop attribute
-
-Created element of type: meta
-Set attribute: content, value: test
-PASS createElement('meta', {content: 'test'}).itemValue == null is true
-
-Created element of type: audio
-Set attribute: src, value: test
-PASS createElement('audio', {src: 'test'}).itemValue == null is true
-
-Created element of type: embed
-Set attribute: src, value: test
-PASS createElement('embed', {src: 'test'}).itemValue == null is true
-
-Created element of type: iframe
-Set attribute: src, value: test
-PASS createElement('iframe', {src: 'test'}).itemValue == null is true
-
-Created element of type: img
-Set attribute: src, value: test
-PASS createElement('img', {src: 'test'}).itemValue == null is true
-
-Created element of type: source
-Set attribute: src, value: test
-PASS createElement('source', {src: 'test'}).itemValue == null is true
-
-Created element of type: track
-Set attribute: src, value: test
-PASS createElement('track', {src: 'test'}).itemValue == null is true
-
-Created element of type: video
-Set attribute: src, value: test
-PASS createElement('video', {src: 'test'}).itemValue == null is true
-
-Created element of type: a
-Set attribute: href, value: test
-PASS createElement('a', {href: 'test'}).itemValue == null is true
-
-Created element of type: area
-Set attribute: href, value: test
-PASS createElement('area', {href: 'test'}).itemValue == null is true
-
-Created element of type: link
-Set attribute: href, value: test
-PASS createElement('link', {href: 'test'}).itemValue == null is true
-
-Created element of type: object
-Set attribute: data, value: test
-PASS createElement('object', {data: 'test'}).itemValue == null is true
-
-Created element of type: time
-PASS createElement('time', {}).itemValue == null is true
-
-Created element of type: time
-Set attribute: datetime, value: test
-PASS createElement('time', {datetime: 'test'}).itemValue == null is true
-
-Created element of type: div
-PASS createElement('div', {}, 'test').itemValue == null is true
-
-Created element of type: madeuponthespot
-PASS createElement('madeuponthespot', {}, 'test').itemValue == null is true
-PASS successfullyParsed is true
-
-TEST COMPLETE
-