Remove MicroData implementation

LayoutTests/fast/dom/MicroData/itemprop-for-an-element-must-be-correct-expected.txt

-This test that the itemProp should be correct for an element that has itemProp attribute.
-
-Created element of type: div
-Set attribute: itemprop, value: foo bar FOO FOo
-PASS element.itemProp.length == 4 is true
-PASS element.itemProp.toString() == 'foo bar FOO FOo' is true
-PASS element.itemProp.item(0) == 'foo' is true
-PASS element.itemProp.item(1) == 'bar' is true
-PASS element.itemProp[0] == 'foo' is true
-PASS element.itemProp[1] == 'bar' is true
-PASS element.itemProp.contains('bar') is true
-
-itemProp should return case-sensitive strings.
-PASS element.itemProp.item(2) == 'FOO' is true
-PASS element.itemProp[2] == 'FOO' is true
-PASS element.itemProp.item(3) == 'FOo' is true
-FAIL element.itemProp[2] == 'FOo' should be true. Was false.
-
-itemProp should not contain an undefined token.
-PASS element.itemProp.contains('test') is false
-
-itemProp.length should be 0 if element doesn't have any tokens.
-Created element of type: div
-Set attribute: itemprop, value: 
-PASS element1.itemProp.length == 0 is true
-PASS successfullyParsed is true
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-TEST COMPLETE
-