Change single-interface mojo bindings to use SequencedTaskRunner.

mojo/public/cpp/bindings/lib/binding_state.h

Index: mojo/public/cpp/bindings/lib/binding_state.h
diff --git a/mojo/public/cpp/bindings/lib/binding_state.h b/mojo/public/cpp/bindings/lib/binding_state.h
index a57d904041dada28943cedc780cff9d6cde5b9b1..4bd4a9fb8f3171cccbbd7031dcf7a4c6a6f3c62f 100644
--- a/mojo/public/cpp/bindings/lib/binding_state.h
+++ b/mojo/public/cpp/bindings/lib/binding_state.h
@@ -15,7 +15,7 @@
 #include "base/macros.h"
 #include "base/memory/ptr_util.h"
 #include "base/memory/ref_counted.h"
-#include "base/single_thread_task_runner.h"
+#include "base/sequenced_task_runner.h"
 #include "mojo/public/cpp/bindings/associated_group.h"
 #include "mojo/public/cpp/bindings/bindings_export.h"
 #include "mojo/public/cpp/bindings/connection_error_callback.h"
@@ -79,7 +79,7 @@ class MOJO_CPP_BINDINGS_EXPORT BindingStateBase {
 
  protected:
   void BindInternal(ScopedMessagePipeHandle handle,
-                    scoped_refptr<base::SingleThreadTaskRunner> runner,
+                    scoped_refptr<base::SequencedTaskRunner> runner,
                     const char* interface_name,
                     std::unique_ptr<MessageReceiver> request_validator,
                     bool passes_associated_kinds,
@@ -103,7 +103,7 @@ class BindingState : public BindingStateBase {
   ~BindingState() { Close(); }
 
   void Bind(ScopedMessagePipeHandle handle,
-            scoped_refptr<base::SingleThreadTaskRunner> runner) {
+            scoped_refptr<base::SequencedTaskRunner> runner) {
     BindingStateBase::BindInternal(
         std::move(handle), runner, Interface::Name_,
         base::MakeUnique<typename Interface::RequestValidator_>(),