Remove DictionaryHelper::Get(..., ExceptionState&)

No one uses it.

Bug: 775318, 624278
Change-Id: I1efddd76f8a7eba5fbe4a0bf1eb12899b391baa7
Reviewed-on: https://chromium-review.googlesource.com/722299
Commit-Queue: Yutaka Hirano <yhirano@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Reviewed-by: Kenichi Ishibashi <bashi@chromium.org>
Reviewed-by: Kouhei Ueno <kouhei@chromium.org>
Reviewed-by: Hitoshi Yoshida <peria@chromium.org>
Cr-Commit-Position: refs/heads/master@{#509289}

third_party/WebKit/Source/bindings/core/v8/Dictionary.h

@@ -123,11 +123,6 @@ struct DictionaryHelper {
   template <typename T>
   static bool Get(const Dictionary&, const StringView& key, T& value);
   template <typename T>
-  static bool Get(const Dictionary&,
-                  const StringView& key,
-                  T& value,
-                  ExceptionState&);
-  template <typename T>
   static bool GetWithUndefinedCheck(const Dictionary& dictionary,
                                     const StringView& key,
                                     T& value) {

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

@@ -243,37 +243,6 @@ CORE_EXPORT bool DictionaryHelper::Get(const Dictionary& dictionary,
   return true;
 }
 
-template <>
-CORE_EXPORT bool DictionaryHelper::Get(const Dictionary& dictionary,
-                                       const StringView& key,
-                                       Vector<Vector<String>>& value,
-                                       ExceptionState& exception_state) {
-  v8::Local<v8::Value> v8_value;
-  if (!dictionary.Get(key, v8_value))
-    return false;
-
-  if (!v8_value->IsArray())
-    return false;
-
-  v8::Local<v8::Array> v8_array = v8::Local<v8::Array>::Cast(v8_value);
-  for (size_t i = 0; i < v8_array->Length(); ++i) {
-    v8::Local<v8::Value> v8_indexed_value;
-    if (!v8_array
-             ->Get(dictionary.V8Context(),
-                   v8::Uint32::New(dictionary.GetIsolate(), i))
-             .ToLocal(&v8_indexed_value))
-      return false;
-    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);
-  }
-
-  return true;
-}
-
 template <>
 CORE_EXPORT bool DictionaryHelper::Get(const Dictionary& dictionary,
                                        const StringView& key,