bindings: Make the sequence conversion code more complaint with WebIDL.

third_party/WebKit/Source/bindings/core/v8/DictionaryHelperForCore.cpp

Index: third_party/WebKit/Source/bindings/core/v8/DictionaryHelperForCore.cpp
diff --git a/third_party/WebKit/Source/bindings/core/v8/DictionaryHelperForCore.cpp b/third_party/WebKit/Source/bindings/core/v8/DictionaryHelperForCore.cpp
index d2a5b0c1b60cc3c108c54ed480601db863c320a9..d61c323e10a609a91a52e4102308ddc0f34612b9 100644
--- a/third_party/WebKit/Source/bindings/core/v8/DictionaryHelperForCore.cpp
+++ b/third_party/WebKit/Source/bindings/core/v8/DictionaryHelperForCore.cpp
@@ -27,6 +27,8 @@
 #include "bindings/core/v8/DictionaryHelperForBindings.h"
 #include "bindings/core/v8/ExceptionMessages.h"
 #include "bindings/core/v8/ExceptionState.h"
+#include "bindings/core/v8/IDLTypes.h"
+#include "bindings/core/v8/NativeValueTraitsImpl.h"
 #include "bindings/core/v8/V8ArrayBufferView.h"
 #include "bindings/core/v8/V8Binding.h"
 #include "bindings/core/v8/V8Element.h"
@@ -273,8 +275,9 @@ CORE_EXPORT bool DictionaryHelper::Get(const Dictionary& dictionary,
                    v8::Uint32::New(dictionary.GetIsolate(), i))
              .ToLocal(&v8_indexed_value))
       return false;
-    Vector<String> indexed_value = ToImplArray<Vector<String>>(
-        v8_indexed_value, i, dictionary.GetIsolate(), exception_state);
+    Vector<String> indexed_value =
+        NativeValueTraits<IDLSequence<IDLString>>::NativeValue(
+            dictionary.GetIsolate(), v8_indexed_value, exception_state);
     if (exception_state.HadException())
       return false;
     value.push_back(indexed_value);