Fix problems on changing 'multiple' state SELECT element to 'single' state.

third_party/WebKit/LayoutTests/fast/forms/select/change-multiple-preserve-selection.html

Index: third_party/WebKit/LayoutTests/fast/forms/select/change-multiple-preserve-selection.html
diff --git a/third_party/WebKit/LayoutTests/fast/forms/select/change-multiple-preserve-selection.html b/third_party/WebKit/LayoutTests/fast/forms/select/change-multiple-preserve-selection.html
index 60bd8c048e3d4a8186f60cc02d4a47e9ec04e132..0e7f0de72e04a5e99b3db2731bd715267c5f768d 100644
--- a/third_party/WebKit/LayoutTests/fast/forms/select/change-multiple-preserve-selection.html
+++ b/third_party/WebKit/LayoutTests/fast/forms/select/change-multiple-preserve-selection.html
@@ -8,9 +8,9 @@ function go() {
     selectElement = document.getElementsByTagName('select')[0];
     shouldBe("selectElement.selectedIndex", "-1");
 
-    // Preserve selection on conversion.
+    // Do not preserve non-selected state on conversion to single.
     selectElement.multiple = false;
-    shouldBe("selectElement.selectedIndex", "-1");
+    shouldBe("selectElement.selectedIndex", "0");
 
     // <select multiple="false"> should have a selection by default and that
     // selection should be preserved.
@@ -24,7 +24,7 @@ function go() {
     selectElement.style.display = '';
     shouldBe("selectElement.selectedIndex", "-1");
     selectElement.multiple = false;
-    shouldBe("selectElement.selectedIndex", "-1");
+    shouldBe("selectElement.selectedIndex", "0");
 
     selectElement = document.getElementsByTagName('select')[3];
     selectElement.style.display = '';