Return MaybeHandle from NewConsString.

src/api.cc

Index: src/api.cc
diff --git a/src/api.cc b/src/api.cc
index 34a431d9b748846dc38768cb2298e1b75b45e30c..6808e418655edc5cd07abaafec744dbb1b7d4c1a 100644
--- a/src/api.cc
+++ b/src/api.cc
@@ -5459,10 +5459,9 @@ Local<String> v8::String::Concat(Handle<String> left, Handle<String> right) {
   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);
 }
 
@@ -7019,15 +7018,15 @@ 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);
   }
 }