Remove implicit conversions from scoped_refptr to T* in mojo/

mojo/system/message_in_transit.cc

Index: mojo/system/message_in_transit.cc
diff --git a/mojo/system/message_in_transit.cc b/mojo/system/message_in_transit.cc
index fe73a79bd2b50216cb36ea4f14553cedd4b8b6ae..2a85dba2d4650c8dd9080bd80d55471006973963 100644
--- a/mojo/system/message_in_transit.cc
+++ b/mojo/system/message_in_transit.cc
@@ -129,7 +129,7 @@ MessageInTransit::MessageInTransit(const View& message_view)
 MessageInTransit::~MessageInTransit() {
   if (dispatchers_) {
     for (size_t i = 0; i < dispatchers_->size(); i++) {
-      if (!(*dispatchers_)[i])
+      if (!(*dispatchers_)[i].get())
         continue;
 
       DCHECK((*dispatchers_)[i]->HasOneRef());
@@ -168,7 +168,7 @@ void MessageInTransit::SetDispatchers(
   dispatchers_ = dispatchers.Pass();
 #ifndef NDEBUG
   for (size_t i = 0; i < dispatchers_->size(); i++)
-    DCHECK(!(*dispatchers_)[i] || (*dispatchers_)[i]->HasOneRef());
+    DCHECK(!(*dispatchers_)[i].get() || (*dispatchers_)[i]->HasOneRef());
 #endif
 }