Move LayoutTests from platform/chromium/... to generic location

LayoutTests/platform/chromium/fast/forms/suggestion-picker/resources/suggestion-picker-common.js

-function valueForEntry(element) {
-    if (!element)
-        return null;
-    var value = element.dataset.value;
-    if (typeof value === "string")
-        return value;
-    var action = element.dataset.action;
-    if (typeof action === "string")
-        return "@" + action;
-    return null;
-}
-
-function highlightedEntry() {
-    return valueForEntry(popupWindow.document.activeElement);
-}
-
-function entryValues() {
-    var elements = popupWindow.document.getElementsByClassName("suggestion-list-entry");
-    var values = [];
-    for (var i = 0; i < elements.length; ++i)
-        values.push(valueForEntry(elements[i]));
-    return values;
-}