content/child: Remove use of MessageLoopProxy and deprecated MessageLoop APIs

content/child/thread_safe_sender.h

Index: content/child/thread_safe_sender.h
diff --git a/content/child/thread_safe_sender.h b/content/child/thread_safe_sender.h
index a6605aaa349b97c0172b3bba8f7905e5c5f48ed9..0d35f2654552bd0af52629c6a470a37e4f62e9fa 100644
--- a/content/child/thread_safe_sender.h
+++ b/content/child/thread_safe_sender.h
@@ -11,7 +11,7 @@
 #include "ipc/ipc_sender.h"
 
 namespace base {
-class MessageLoopProxy;
+class SingleThreadTaskRunner;
 }
 
 namespace IPC {
@@ -29,8 +29,9 @@ class CONTENT_EXPORT ThreadSafeSender
   bool Send(IPC::Message* msg) override;
 
  protected:
-  ThreadSafeSender(const scoped_refptr<base::MessageLoopProxy>& main_loop,
-                   const scoped_refptr<IPC::SyncMessageFilter>& sync_filter);
+  ThreadSafeSender(
+      const scoped_refptr<base::SingleThreadTaskRunner>& main_task_runner,
+      const scoped_refptr<IPC::SyncMessageFilter>& sync_filter);
   ~ThreadSafeSender() override;
 
  private:
@@ -39,7 +40,7 @@ class CONTENT_EXPORT ThreadSafeSender
   friend class WebIDBCursorImplTest;
   friend class base::RefCountedThreadSafe<ThreadSafeSender>;
 
-  scoped_refptr<base::MessageLoopProxy> main_loop_;
+  scoped_refptr<base::SingleThreadTaskRunner> main_task_runner_;
   scoped_refptr<IPC::SyncMessageFilter> sync_filter_;
 
   DISALLOW_COPY_AND_ASSIGN(ThreadSafeSender);