Default value of |size| IDL attribute of HTMLSelectElement should be 0.

LayoutTests/fast/forms/select/select-size-expected.txt

Index: LayoutTests/fast/forms/select/select-size-expected.txt
diff --git a/LayoutTests/fast/forms/select/select-size-expected.txt b/LayoutTests/fast/forms/select/select-size-expected.txt
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+++ b/LayoutTests/fast/forms/select/select-size-expected.txt
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+Test HTMLSelectElement::size behavior.
+
+On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
+
+
+PASS select.size is 0
+PASS select.setAttribute("size", "1"); select.size is 1
+PASS select.setAttribute("size", "2"); select.size is 2
+PASS select.setAttribute("size", "3"); select.size is 3
+PASS select.setAttribute("size", "4"); select.size is 4
+PASS select.setAttribute("size", "0"); select.size is 0
+PASS select.setAttribute("size", "-1"); select.size is 0
+PASS select.setAttribute("size", "abc"); select.size is 0
+PASS select.setAttribute("size", "3.14"); select.size is 3
+PASS successfullyParsed is true
+
+TEST COMPLETE
+