Implement support to consider <space> key as part of typeAhead searching.

LayoutTests/fast/forms/select/select-typeahead-with-spacekey-expected.txt

Index: LayoutTests/fast/forms/select/select-typeahead-with-spacekey-expected.txt
diff --git a/LayoutTests/fast/forms/select/select-typeahead-with-spacekey-expected.txt b/LayoutTests/fast/forms/select/select-typeahead-with-spacekey-expected.txt
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+++ b/LayoutTests/fast/forms/select/select-typeahead-with-spacekey-expected.txt
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+Two keystrokes are considered as part of one typehead session if time difference between them is less than 1 sec
+
+On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
+
+
+1. space key as part of search string.
+PASS internals.isSelectPopupVisible(popup) is false
+PASS popup.value is "United States"
+2. space key as part of search string with some delay.
+PASS internals.isSelectPopupVisible(popup) is false
+PASS popup.value is "Spain"
+3. space key to open popup menu.
+PASS internals.isSelectPopupVisible(popup) is true
+PASS popup.value is "United Arab Emerites"
+PASS successfullyParsed is true
+
+TEST COMPLETE
+