fixed <select> element isn't updated after its single option removing.

third_party/WebKit/Source/core/html/HTMLSelectElement.cpp

Index: third_party/WebKit/Source/core/html/HTMLSelectElement.cpp
diff --git a/third_party/WebKit/Source/core/html/HTMLSelectElement.cpp b/third_party/WebKit/Source/core/html/HTMLSelectElement.cpp
index a344bcde69df0cb2454ba0cc2ee0f00afd10af7c..ca017d1f0dfae2ab4d9ed49c02ccac47dec13ec6 100644
--- a/third_party/WebKit/Source/core/html/HTMLSelectElement.cpp
+++ b/third_party/WebKit/Source/core/html/HTMLSelectElement.cpp
@@ -836,7 +836,7 @@ void HTMLSelectElement::resetToDefaultSelection(ResetReason reason)
         }
         ++optionIndex;
     }
-    if (!lastSelectedOption && m_size <= 1 && firstEnabledOption && !firstEnabledOption->selected()) {
+    if (!lastSelectedOption && m_size <= 1 && (!firstEnabledOption || (firstEnabledOption && !firstEnabledOption->selected()))) {
         selectOption(firstEnabledOption, reason == ResetReasonSelectedOptionRemoved ? 0 : DeselectOtherOptions);
         lastSelectedOption = firstEnabledOption;
         didChange = true;