Remove MicroData implementation

LayoutTests/fast/dom/MicroData/itemid-attribute-test-expected.txt

-itemid attribute simple test.
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-Created element of type: div
-Set attribute: itemid, value: http://example.com/foo
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-The itemId attribute must be defined.
-PASS element.itemId is defined.
-PASS element.itemId is 'http://example.com/foo'
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-itemId attribute must be case-senaitive.
-Created element of type: div
-Set attribute: itemid, value: http://example.com/FOO
-PASS createElement('div', {itemid: 'http://example.com/FOO'}).itemId == 'http://example.com/FOO'; is true
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-itemId must strip leading and trailing whitespace.
-Created element of type: div
-Set attribute: itemid, value:  http://example.com/foo 
-PASS createElement('div', {itemid: ' http://example.com/foo '}).itemId == 'http://example.com/foo'; is true
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-itemId must strip leading whitespace.
-Created element of type: div
-Set attribute: itemid, value:   http://example.com/foo
-PASS createElement('div', {itemid: '  http://example.com/foo'}).itemId == 'http://example.com/foo'; is true
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-itemId must strip trailing whitespace.
-Created element of type: div
-Set attribute: itemid, value: http://example.com/foo  
-PASS createElement('div', {itemid: 'http://example.com/foo  '}).itemId == 'http://example.com/foo'; is true
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-itemId must be read/write.
-PASS element.itemId = 'http://example.com/bar'; element.itemId == 'http://example.com/bar' is true
-PASS successfullyParsed is true
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-TEST COMPLETE
-