Use V8 Maybe APIs in extensions/renderer

extensions/renderer/resource_bundle_source_map.cc

Index: extensions/renderer/resource_bundle_source_map.cc
diff --git a/extensions/renderer/resource_bundle_source_map.cc b/extensions/renderer/resource_bundle_source_map.cc
index 88fc5372185d0ebd511fc7c8cd716914701480e3..09f2a98d830993fc580492111370647cb57a345d 100644
--- a/extensions/renderer/resource_bundle_source_map.cc
+++ b/extensions/renderer/resource_bundle_source_map.cc
@@ -48,8 +48,9 @@ v8::Local<v8::String> ResourceBundleSourceMap::ConvertString(
     const base::StringPiece& string) {
   // v8 takes ownership of the StaticV8ExternalOneByteStringResource (see
   // v8::String::NewExternal()).
-  return v8::String::NewExternal(
-      isolate, new StaticV8ExternalOneByteStringResource(string));
+  return v8::String::NewExternalOneByte(
+             isolate, new StaticV8ExternalOneByteStringResource(string))
+      .ToLocalChecked();
 }
 
 }  // namespace extensions