Move mojo::internal::MessageBuilder out of the |internal| namespace.

mojo/public/cpp/bindings/tests/connector_unittest.cc

Index: mojo/public/cpp/bindings/tests/connector_unittest.cc
diff --git a/mojo/public/cpp/bindings/tests/connector_unittest.cc b/mojo/public/cpp/bindings/tests/connector_unittest.cc
index c236d40e9852ab42417de3eb71bb833d958cdb25..a85d8d323c5a4b45169b23aac60b1f454202d5b1 100644
--- a/mojo/public/cpp/bindings/tests/connector_unittest.cc
+++ b/mojo/public/cpp/bindings/tests/connector_unittest.cc
@@ -36,7 +36,7 @@ class MessageAccumulator : public MessageReceiver {
 
 class ConnectorDeletingMessageAccumulator : public MessageAccumulator {
  public:
-  ConnectorDeletingMessageAccumulator(internal::Connector** connector)
+  explicit ConnectorDeletingMessageAccumulator(internal::Connector** connector)
       : connector_(connector) {}
 
   bool Accept(Message* message) override {
@@ -51,7 +51,7 @@ class ConnectorDeletingMessageAccumulator : public MessageAccumulator {
 
 class ReentrantMessageAccumulator : public MessageAccumulator {
  public:
-  ReentrantMessageAccumulator(internal::Connector* connector)
+  explicit ReentrantMessageAccumulator(internal::Connector* connector)
       : connector_(connector), number_of_calls_(0) {}
 
   bool Accept(Message* message) override {
@@ -83,7 +83,7 @@ class ConnectorTest : public testing::Test {
 
   void AllocMessage(const char* text, Message* message) {
     size_t payload_size = strlen(text) + 1;  // Plus null terminator.
-    internal::MessageBuilder builder(1, payload_size);
+    MessageBuilder builder(1, payload_size);
     memcpy(builder.buffer()->Allocate(payload_size), text, payload_size);
 
     builder.message()->MoveTo(message);