Fix a crash when getElementsByClassName() is called twice with the same argument including capital …

third_party/WebKit/Source/core/dom/ElementTest.cpp

Index: third_party/WebKit/Source/core/dom/ElementTest.cpp
diff --git a/third_party/WebKit/Source/core/dom/ElementTest.cpp b/third_party/WebKit/Source/core/dom/ElementTest.cpp
index afffcd8eb1a20b775cf6b275f81c09d22d0854db..66f3b9b78652436628fd40857c70b35478fd00be 100644
--- a/third_party/WebKit/Source/core/dom/ElementTest.cpp
+++ b/third_party/WebKit/Source/core/dom/ElementTest.cpp
@@ -239,4 +239,12 @@ TEST_F(ElementTest, StickySubtreesAreTrackedCorrectly) {
   EXPECT_TRUE(great_grandchild->StyleRef().SubtreeIsSticky());
 }
 
+TEST_F(ElementTest, GetElementsByClassNameCrash) {
+  // Test for a crash in NodeListsNodeData::AddCache().
+  ASSERT_TRUE(GetDocument().InQuirksMode());
+  GetDocument().body()->getElementsByClassName("ABC DEF");
+  GetDocument().body()->getElementsByClassName("ABC DEF");
+  // The test passes if no crash happens.
+}
+
 }  // namespace blink