Return MaybeHandle from NewConsString.

src/api.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 5441 matching lines @@
 }
 
 
 Local<String> v8::String::Concat(Handle<String> left, Handle<String> right) {
   i::Handle<i::String> left_string = Utils::OpenHandle(*left);
   i::Isolate* isolate = left_string->GetIsolate();
   EnsureInitializedForIsolate(isolate, "v8::String::New()");
   LOG_API(isolate, "String::New(char)");
   ENTER_V8(isolate);
   i::Handle<i::String> right_string = Utils::OpenHandle(*right);
-  i::Handle<i::String> result = isolate->factory()->NewConsString(left_string,
-                                                                  right_string);
   // We do not expect this to fail. Change this if it does.
-  CHECK(!result.is_null());
+  i::Handle<i::String> result = isolate->factory()->NewConsString(
+      left_string, right_string).ToHandleChecked();
   return Utils::ToLocal(result);
 }
 
 
 static i::Handle<i::String> NewExternalStringHandle(
     i::Isolate* isolate,
     v8::String::ExternalStringResource* resource) {
   i::Handle<i::String> result =
       isolate->factory()->NewExternalStringFromTwoByte(resource);
   // We do not expect this to fail. Change this if it does.
@@ skipping 1536 matching lines @@
 }
 
 
 #endif  // ENABLE_DEBUGGER_SUPPORT
 
 
 Handle<String> CpuProfileNode::GetFunctionName() const {
   i::Isolate* isolate = i::Isolate::Current();
   const i::ProfileNode* node = reinterpret_cast<const i::ProfileNode*>(this);
   const i::CodeEntry* entry = node->entry();
+  i::Handle<i::String> name =
+      isolate->factory()->InternalizeUtf8String(entry->name());
   if (!entry->has_name_prefix()) {
-    return ToApiHandle<String>(
-        isolate->factory()->InternalizeUtf8String(entry->name()));
+    return ToApiHandle<String>(name);
   } else {
+    // We do not expect this to fail. Change this if it does.
     i::Handle<i::String> cons = isolate->factory()->NewConsString(
         isolate->factory()->InternalizeUtf8String(entry->name_prefix()),
-        isolate->factory()->InternalizeUtf8String(entry->name()));
-    // We do not expect this to fail. Change this if it does.
-    CHECK(!cons.is_null());
+        name).ToHandleChecked();
     return ToApiHandle<String>(cons);
   }
 }
 
 
 int CpuProfileNode::GetScriptId() const {
   const i::ProfileNode* node = reinterpret_cast<const i::ProfileNode*>(this);
   const i::CodeEntry* entry = node->entry();
   return entry->script_id();
 }
@@ skipping 610 matching lines @@
   Isolate* isolate = reinterpret_cast<Isolate*>(info.GetIsolate());
   Address callback_address =
       reinterpret_cast<Address>(reinterpret_cast<intptr_t>(callback));
   VMState<EXTERNAL> state(isolate);
   ExternalCallbackScope call_scope(isolate, callback_address);
   callback(info);
 }
 
 
 } }  // namespace v8::internal