Move more Mojo bindings helpers out of internal namespace

mojo/mojo_public.gypi

Index: mojo/mojo_public.gypi
diff --git a/mojo/mojo_public.gypi b/mojo/mojo_public.gypi
index 71dc726fcff7a1d567044ddaf6b42e0aa5bd7e29..b2057537bf591af0157544d0f90267e96b884b7f 100644
--- a/mojo/mojo_public.gypi
+++ b/mojo/mojo_public.gypi
@@ -18,6 +18,7 @@
       'public/cpp/bindings/associated_interface_request.h',
       'public/cpp/bindings/binding.h',
       'public/cpp/bindings/binding_set.h',
+      'public/cpp/bindings/connector.h',
       'public/cpp/bindings/enum_traits.h',
       'public/cpp/bindings/interface_endpoint_client.h',
       'public/cpp/bindings/interface_endpoint_controller.h',
@@ -35,7 +36,6 @@
       'public/cpp/bindings/lib/bindings_internal.h',
       'public/cpp/bindings/lib/buffer.h',
       'public/cpp/bindings/lib/connector.cc',
-      'public/cpp/bindings/lib/connector.h',
       'public/cpp/bindings/lib/control_message_handler.cc',
       'public/cpp/bindings/lib/control_message_handler.h',
       'public/cpp/bindings/lib/control_message_proxy.cc',
@@ -56,7 +56,6 @@
       'public/cpp/bindings/lib/message_builder.h',
       'public/cpp/bindings/lib/message_filter.cc',
       'public/cpp/bindings/lib/message_header_validator.cc',
-      'public/cpp/bindings/lib/message_header_validator.h',
       'public/cpp/bindings/lib/message_internal.h',
       'public/cpp/bindings/lib/multiplex_router.cc',
       'public/cpp/bindings/lib/multiplex_router.h',
@@ -69,10 +68,7 @@
       'public/cpp/bindings/lib/native_struct_serialization.h',
       'public/cpp/bindings/lib/no_interface.cc',
       'public/cpp/bindings/lib/pipe_control_message_handler.cc',
-      'public/cpp/bindings/lib/pipe_control_message_handler.h',
-      'public/cpp/bindings/lib/pipe_control_message_handler_delegate.h',
       'public/cpp/bindings/lib/pipe_control_message_proxy.cc',
-      'public/cpp/bindings/lib/pipe_control_message_proxy.h',
       'public/cpp/bindings/lib/router.cc',
       'public/cpp/bindings/lib/router.h',
       'public/cpp/bindings/lib/scoped_interface_endpoint_handle.cc',
@@ -88,7 +84,6 @@
       'public/cpp/bindings/lib/sync_call_restrictions.cc',
       'public/cpp/bindings/lib/sync_handle_registry.cc',
       'public/cpp/bindings/lib/sync_handle_watcher.cc',
-      'public/cpp/bindings/lib/sync_handle_watcher.h',
       'public/cpp/bindings/lib/template_util.h',
       'public/cpp/bindings/lib/validate_params.h',
       'public/cpp/bindings/lib/validation_context.cc',
@@ -102,9 +97,13 @@
       'public/cpp/bindings/map_traits_stl.h',
       'public/cpp/bindings/message.h',
       'public/cpp/bindings/message_filter.h',
+      'public/cpp/bindings/message_header_validator.h',
       'public/cpp/bindings/native_enum.h',
       'public/cpp/bindings/native_struct.h',
       'public/cpp/bindings/no_interface.h',
+      'public/cpp/bindings/pipe_control_message_handler.h',
+      'public/cpp/bindings/pipe_control_message_handler_delegate.h',
+      'public/cpp/bindings/pipe_control_message_proxy.h',
       'public/cpp/bindings/scoped_interface_endpoint_handle.h',
       'public/cpp/bindings/stl_converters.h',
       'public/cpp/bindings/string.h',
@@ -118,6 +117,7 @@
       'public/cpp/bindings/struct_traits.h',
       'public/cpp/bindings/sync_call_restrictions.h',
       'public/cpp/bindings/sync_handle_registry.h',
+      'public/cpp/bindings/sync_handle_watcher.h',
       'public/cpp/bindings/type_converter.h',
     ],
     'mojo_cpp_system_sources': [