Make new TaskRunner, SequencedTaskRunner, and SingleThreadTaskRunner interfaces

remoting/base/plugin_message_loop_proxy.cc

Index: remoting/base/plugin_message_loop_proxy.cc
diff --git a/remoting/base/plugin_message_loop_proxy.cc b/remoting/base/plugin_message_loop_proxy.cc
index b3bc4537b0ff6410d3b5871c8edbf5f9975c2bfe..6986fa90409961053908c8aafd703aff466810eb 100644
--- a/remoting/base/plugin_message_loop_proxy.cc
+++ b/remoting/base/plugin_message_loop_proxy.cc
@@ -59,7 +59,7 @@ bool PluginMessageLoopProxy::PostNonNestableDelayedTask(
   return PostDelayedTask(from_here, task, delay_ms);
 }
 
-bool PluginMessageLoopProxy::BelongsToCurrentThread() {
+bool PluginMessageLoopProxy::RunsTasksOnCurrentThread() const {
   // In pepper plugins ideally we should use pp::Core::IsMainThread,
   // but it is problematic because we would need to keep reference to
   // Core somewhere, e.g. make the delegate ref-counted.