Move more Mojo bindings helpers out of internal namespace

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

Index: mojo/public/cpp/bindings/lib/message_builder.h
diff --git a/mojo/public/cpp/bindings/lib/message_builder.h b/mojo/public/cpp/bindings/lib/message_builder.h
index 19eeeda79c7e7cf9df7e81a3df1a0f065ace31fe..a5a050f7ed7ad16b9cd2abac291a093b510492f5 100644
--- a/mojo/public/cpp/bindings/lib/message_builder.h
+++ b/mojo/public/cpp/bindings/lib/message_builder.h
@@ -46,7 +46,7 @@ class RequestMessageBuilder : public MessageWithRequestIDBuilder {
   RequestMessageBuilder(uint32_t name, size_t payload_size)
       : MessageWithRequestIDBuilder(name,
                                     payload_size,
-                                    kMessageExpectsResponse,
+                                    Message::kFlagExpectsResponse,
                                     0) {}
 
   RequestMessageBuilder(uint32_t name,
@@ -54,7 +54,7 @@ class RequestMessageBuilder : public MessageWithRequestIDBuilder {
                         uint32_t extra_flags)
       : MessageWithRequestIDBuilder(name,
                                     payload_size,
-                                    kMessageExpectsResponse | extra_flags,
+                                    Message::kFlagExpectsResponse | extra_flags,
                                     0) {}
 };
 
@@ -65,7 +65,7 @@ class ResponseMessageBuilder : public MessageWithRequestIDBuilder {
                          uint64_t request_id)
       : MessageWithRequestIDBuilder(name,
                                     payload_size,
-                                    kMessageIsResponse,
+                                    Message::kFlagIsResponse,
                                     request_id) {}
 
   ResponseMessageBuilder(uint32_t name,
@@ -74,7 +74,7 @@ class ResponseMessageBuilder : public MessageWithRequestIDBuilder {
                          uint32_t extra_flags)
       : MessageWithRequestIDBuilder(name,
                                     payload_size,
-                                    kMessageIsResponse | extra_flags,
+                                    Message::kFlagIsResponse | extra_flags,
                                     request_id) {}
 };