Select elements should clear type-ahead session on blur.

Source/core/html/HTMLSelectElement.cpp

Index: Source/core/html/HTMLSelectElement.cpp
diff --git a/Source/core/html/HTMLSelectElement.cpp b/Source/core/html/HTMLSelectElement.cpp
index 93af0b216963e078bdb62f8c9b3a07511ae8bae7..59c17bbc8a1c3bc0778a792ff166ca24c0cb4494 100644
--- a/Source/core/html/HTMLSelectElement.cpp
+++ b/Source/core/html/HTMLSelectElement.cpp
@@ -1052,6 +1052,7 @@ void HTMLSelectElement::dispatchFocusEvent(Element* oldFocusedElement, WebFocusT
 
 void HTMLSelectElement::dispatchBlurEvent(Element* newFocusedElement, WebFocusType type, InputDeviceCapabilities* sourceCapabilities)
 {
+    m_typeAhead.resetSession();
     // We only need to fire change events here for menu lists, because we fire
     // change events for list boxes whenever the selection change is actually made.
     // This matches other browsers' behavior.
@@ -1951,4 +1952,9 @@ void HTMLSelectElement::detach(const AttachContext& context)
     m_popup = nullptr;
 }
 
+void HTMLSelectElement::resetTypeAheadSessionForTesting()
+{
+    m_typeAhead.resetSession();
+}
+
 } // namespace blink