Use createV8Entry() and toV8Value() with context and isolate defined in WebDOMFileSystem.

extensions/renderer/file_system_natives.cc

Index: extensions/renderer/file_system_natives.cc
diff --git a/extensions/renderer/file_system_natives.cc b/extensions/renderer/file_system_natives.cc
index 94f8d21d1c7036fc7273e4c8a6a8c6e97f04dbfd..256c876deed0275f92169d1e7042867b6d969fe8 100644
--- a/extensions/renderer/file_system_natives.cc
+++ b/extensions/renderer/file_system_natives.cc
@@ -64,7 +64,8 @@ void FileSystemNatives::GetIsolatedFileSystem(
       blink::WebDOMFileSystem::create(webframe,
                                       blink::WebFileSystemTypeIsolated,
                                       blink::WebString::fromUTF8(name),
-                                      root_url).toV8Value());
+                                      root_url)
+          .toV8Value(args.Holder(), args.GetIsolate()));
 }
 
 void FileSystemNatives::GetFileEntry(
@@ -103,7 +104,9 @@ void FileSystemNatives::GetFileEntry(
           blink::WebString::fromUTF8(file_system_name),
           file_system_root_url)
           .createV8Entry(blink::WebString::fromUTF8(file_path_string),
-                         entry_type));
+                         entry_type,
+                         args.Holder(),
+                         args.GetIsolate()));
 }
 
 void FileSystemNatives::CrackIsolatedFileSystemName(