Implement select element list box with shadow DOM.

LayoutTests/platform/chromium-win/fast/forms/listbox-onchange-expected.txt

Index: LayoutTests/platform/chromium-win/fast/forms/listbox-onchange-expected.txt
diff --git a/LayoutTests/platform/chromium-win/fast/forms/listbox-onchange-expected.txt b/LayoutTests/platform/chromium-win/fast/forms/listbox-onchange-expected.txt
index 44d0d43421959b33c29b4870480108882da252b8..bc3185a2efb44cb653c93ac1d588dfcd9f002b73 100644
--- a/LayoutTests/platform/chromium-win/fast/forms/listbox-onchange-expected.txt
+++ b/LayoutTests/platform/chromium-win/fast/forms/listbox-onchange-expected.txt
@@ -5,37 +5,23 @@ Results:
 onChange fired
 3) Make sure onChange fires when clicking
 onChange fired
-Incorrect selection: "1" instead of "2"
 4) Make sure onChange doesn't fire when clicking again on the same item
-Incorrect selection: "1" instead of "2"
 5) Make sure onChange fires when clicking on a new item
 onChange fired
 6) Make sure onChange fires when changing the selection with the keyboard
 onChange fired
 7) Make sure onChange doesn't fire when setting the select element's value from JS
 8) Make sure onChange doesn't fire when clicking on the already selected option
-onChange fired
-Incorrect selection: "1" instead of "2"
 9) Make sure onChange doesn't fire when setting an option's selected state from JS
-Incorrect selection: "1,3" instead of "2,3"
-Incorrect selection: "1,3" instead of "3"
 10) Make sure onChange doesn't fire when clicking on this option
-onChange fired
-Incorrect selection: "2" instead of "3"
 11) Make sure onChange fires when deselecting the last selected option with a mouse click
 onChange fired
 12) Make sure onChange doesn't fire when adding a new selected option
 13) Make sure onChange doesn't fire when clicking on it
-onChange fired
-Incorrect selection: "3" instead of "4"
 14) Make sure onChange fires when clicking on a previously selected option
 onChange fired
-Incorrect selection: "2,3" instead of "3,4"
 15) Make sure onChange doesn't fire when removing a selected option
-Incorrect selection: "2,3" instead of "3"
 16) Make sure onChange doesn't fire when clicking on the option that remains selected
-onChange fired
-Incorrect selection: "2" instead of "3"
 17) Make sure onChange fires when typing the name of an option
 onChange fired
 18) Make sure onChange doesn't fire when leaving the select