Merge "Improve performance of SELECT element by optimizing Vector." to M52

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 21d8caa030c0c2362134f2dda82dd5212ddd0ac7..2e8c5f00015959c75756a3c847ed368892124787 100644
--- a/third_party/WebKit/Source/core/html/HTMLSelectElement.cpp
+++ b/third_party/WebKit/Source/core/html/HTMLSelectElement.cpp
@@ -654,7 +654,7 @@ void HTMLSelectElement::setActiveSelectionAnchor(HTMLOptionElement* option)
     // 3. Drag the mouse pointer onto the fourth OPTION
     //   m_activeSelectionEndIndex = 3, options at 1-3 indices are selected.
     //   updateListBoxSelection needs to clear selection of the fifth OPTION.
-    m_cachedStateForActiveSelection.clear();
+    m_cachedStateForActiveSelection.resize(0);
     for (auto& element : listItems()) {
         m_cachedStateForActiveSelection.append(isHTMLOptionElement(*element) && toHTMLOptionElement(element)->selected());
     }
@@ -803,7 +803,7 @@ void HTMLSelectElement::setRecalcListItems()
 void HTMLSelectElement::recalcListItems() const
 {
     TRACE_EVENT0("blink", "HTMLSelectElement::recalcListItems");
-    m_listItems.clear();
+    m_listItems.resize(0);
 
     m_shouldRecalcListItems = false;