[intl] Remove redundant type checking system

src/i18n.cc

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 // limitations under the License.
 
 #include "src/i18n.h"
 
 #include <memory>
 
 #include "src/api.h"
@@ skipping 742 matching lines @@
     SetResolvedDateSettings(isolate, icu_locale, date_format, resolved);
   }
 
   return date_format;
 }
 
 
 icu::SimpleDateFormat* DateFormat::UnpackDateFormat(
     Isolate* isolate,
     Handle<JSObject> obj) {
-  Handle<String> key =
-      isolate->factory()->NewStringFromStaticChars("dateFormat");
-  Maybe<bool> maybe = JSReceiver::HasOwnProperty(obj, key);
-  CHECK(maybe.IsJust());
-  if (maybe.FromJust()) {
-    return reinterpret_cast<icu::SimpleDateFormat*>(
-        obj->GetInternalField(0));
-  }
-
-  return NULL;
+  return reinterpret_cast<icu::SimpleDateFormat*>(obj->GetInternalField(0));
 }
 
 void DateFormat::DeleteDateFormat(const v8::WeakCallbackInfo<void>& data) {
   delete reinterpret_cast<icu::SimpleDateFormat*>(data.GetInternalField(0));
   GlobalHandles::Destroy(reinterpret_cast<Object**>(data.GetParameter()));
 }
 
 
 icu::DecimalFormat* NumberFormat::InitializeNumberFormat(
     Isolate* isolate,
@@ skipping 34 matching lines @@
     SetResolvedNumberSettings(isolate, icu_locale, number_format, resolved);
   }
 
   return number_format;
 }
 
 
 icu::DecimalFormat* NumberFormat::UnpackNumberFormat(
     Isolate* isolate,
     Handle<JSObject> obj) {
-  Handle<String> key =
-      isolate->factory()->NewStringFromStaticChars("numberFormat");
-  Maybe<bool> maybe = JSReceiver::HasOwnProperty(obj, key);
-  CHECK(maybe.IsJust());
-  if (maybe.FromJust()) {
-    return reinterpret_cast<icu::DecimalFormat*>(obj->GetInternalField(0));
-  }
-
-  return NULL;
+  return reinterpret_cast<icu::DecimalFormat*>(obj->GetInternalField(0));
 }
 
 void NumberFormat::DeleteNumberFormat(const v8::WeakCallbackInfo<void>& data) {
   delete reinterpret_cast<icu::DecimalFormat*>(data.GetInternalField(0));
   GlobalHandles::Destroy(reinterpret_cast<Object**>(data.GetParameter()));
 }
 
 
 icu::Collator* Collator::InitializeCollator(
     Isolate* isolate,
@@ skipping 31 matching lines @@
   } else {
     SetResolvedCollatorSettings(isolate, icu_locale, collator, resolved);
   }
 
   return collator;
 }
 
 
 icu::Collator* Collator::UnpackCollator(Isolate* isolate,
                                         Handle<JSObject> obj) {
-  Handle<String> key = isolate->factory()->NewStringFromStaticChars("collator");
-  Maybe<bool> maybe = JSReceiver::HasOwnProperty(obj, key);
-  CHECK(maybe.IsJust());
-  if (maybe.FromJust()) {
-    return reinterpret_cast<icu::Collator*>(obj->GetInternalField(0));
-  }
-
-  return NULL;
+  return reinterpret_cast<icu::Collator*>(obj->GetInternalField(0));
 }
 
 void Collator::DeleteCollator(const v8::WeakCallbackInfo<void>& data) {
   delete reinterpret_cast<icu::Collator*>(data.GetInternalField(0));
   GlobalHandles::Destroy(reinterpret_cast<Object**>(data.GetParameter()));
 }
 
 
 icu::BreakIterator* BreakIterator::InitializeBreakIterator(
     Isolate* isolate,
@@ skipping 34 matching lines @@
     SetResolvedBreakIteratorSettings(
         isolate, icu_locale, break_iterator, resolved);
   }
 
   return break_iterator;
 }
 
 
 icu::BreakIterator* BreakIterator::UnpackBreakIterator(Isolate* isolate,
                                                        Handle<JSObject> obj) {
-  Handle<String> key =
-      isolate->factory()->NewStringFromStaticChars("breakIterator");
-  Maybe<bool> maybe = JSReceiver::HasOwnProperty(obj, key);
-  CHECK(maybe.IsJust());
-  if (maybe.FromJust()) {
-    return reinterpret_cast<icu::BreakIterator*>(obj->GetInternalField(0));
-  }
-
-  return NULL;
+  return reinterpret_cast<icu::BreakIterator*>(obj->GetInternalField(0));
 }
 
 void BreakIterator::DeleteBreakIterator(
     const v8::WeakCallbackInfo<void>& data) {
   delete reinterpret_cast<icu::BreakIterator*>(data.GetInternalField(0));
   delete reinterpret_cast<icu::UnicodeString*>(data.GetInternalField(1));
   GlobalHandles::Destroy(reinterpret_cast<Object**>(data.GetParameter()));
 }
 
 }  // namespace internal
 }  // namespace v8