binding: Indexed property returns undefined if out-of-range.

third_party/WebKit/Source/bindings/tests/results/core/V8TestInterface.cpp

Index: third_party/WebKit/Source/bindings/tests/results/core/V8TestInterface.cpp
diff --git a/third_party/WebKit/Source/bindings/tests/results/core/V8TestInterface.cpp b/third_party/WebKit/Source/bindings/tests/results/core/V8TestInterface.cpp
index a033833252b4dfca4279fc4a9c1e3026f9eb8484..7b21b26c0a60f3a4129280d762cd403961032fef 100644
--- a/third_party/WebKit/Source/bindings/tests/results/core/V8TestInterface.cpp
+++ b/third_party/WebKit/Source/bindings/tests/results/core/V8TestInterface.cpp
@@ -2553,9 +2553,14 @@ static void indexedPropertyGetter(uint32_t index, const v8::PropertyCallbackInfo
 {
     TestInterfaceImplementation* impl = V8TestInterface::toImpl(info.Holder());
 
+    // We assume that all the implementations support length() method, although
+    // the spec doesn't require that length() must exist.  It's okay that
+    // the interface does not have length attribute as long as the
+    // implementation supports length() member function.
+    if (index >= impl->length())
+        return;  // Returns undefined due to out-of-range.
+
     String result = impl->anonymousIndexedGetter(index);
-    if (result.isNull())
-        return;
     v8SetReturnValueString(info, result, info.GetIsolate());
 }