Convert //ppapi to use std::unique_ptr

ppapi/proxy/nacl_message_scanner.h

Index: ppapi/proxy/nacl_message_scanner.h
diff --git a/ppapi/proxy/nacl_message_scanner.h b/ppapi/proxy/nacl_message_scanner.h
index 8c5f7662ae7e6cfff2b8b5ada969a774ba2bbb51..9f9d73a7b93ec910d11afdac4e791853d4411054 100644
--- a/ppapi/proxy/nacl_message_scanner.h
+++ b/ppapi/proxy/nacl_message_scanner.h
@@ -8,10 +8,10 @@
 #include <stdint.h>
 
 #include <map>
+#include <memory>
 #include <vector>
 
 #include "base/macros.h"
-#include "base/memory/scoped_ptr.h"
 #include "base/synchronization/lock.h"
 #include "ppapi/c/pp_resource.h"
 #include "ppapi/proxy/ppapi_proxy_export.h"
@@ -47,12 +47,12 @@ class PPAPI_PROXY_EXPORT NaClMessageScanner {
   bool ScanMessage(const IPC::Message& msg,
                    uint32_t type,
                    std::vector<SerializedHandle>* handles,
-                   scoped_ptr<IPC::Message>* new_msg_ptr);
+                   std::unique_ptr<IPC::Message>* new_msg_ptr);
 
   // Scans an untrusted message for items that require special handling. If the
   // message had to be rewritten, sets |new_msg_ptr| to the new message.
   void ScanUntrustedMessage(const IPC::Message& untrusted_msg,
-                            scoped_ptr<IPC::Message>* new_msg_ptr);
+                            std::unique_ptr<IPC::Message>* new_msg_ptr);
 
   // FileSystem information for quota auditing.
   class PPAPI_PROXY_EXPORT FileSystem {