Remove remaining use of the deprecated MessageLoopProxy

gin/per_isolate_data.cc

Index: gin/per_isolate_data.cc
diff --git a/gin/per_isolate_data.cc b/gin/per_isolate_data.cc
index 99c928cdd8ea1e02b0699c2243c176e537899286..8f72d7661452c59bded0228c0dd02b0a3d6c3a7e 100644
--- a/gin/per_isolate_data.cc
+++ b/gin/per_isolate_data.cc
@@ -3,7 +3,8 @@
 // found in the LICENSE file.
 
 #include "base/logging.h"
-#include "base/message_loop/message_loop_proxy.h"
+#include "base/single_thread_task_runner.h"
+#include "base/thread_task_runner_handle.h"
 #include "gin/per_isolate_data.h"
 #include "gin/public/gin_embedders.h"
 
@@ -21,7 +22,7 @@ PerIsolateData::PerIsolateData(Isolate* isolate,
                                ArrayBuffer::Allocator* allocator)
     : isolate_(isolate),
       allocator_(allocator),
-      message_loop_proxy_(base::MessageLoopProxy::current()) {
+      task_runner_(base::ThreadTaskRunnerHandle::Get()) {
   isolate_->SetData(kEmbedderNativeGin, this);
 }