Convert //ppapi to use std::unique_ptr

ppapi/proxy/proxy_channel.h

Index: ppapi/proxy/proxy_channel.h
diff --git a/ppapi/proxy/proxy_channel.h b/ppapi/proxy/proxy_channel.h
index 0e657f73ad51bebd270cc423a8e15bd003c75e6b..9d981da9e0e93d15a7a07bbc0d197cb78c86b1b4 100644
--- a/ppapi/proxy/proxy_channel.h
+++ b/ppapi/proxy/proxy_channel.h
@@ -5,9 +5,10 @@
 #ifndef PPAPI_PROXY_PROXY_CHANNEL_H_
 #define PPAPI_PROXY_PROXY_CHANNEL_H_
 
+#include <memory>
+
 #include "base/files/scoped_file.h"
 #include "base/macros.h"
-#include "base/memory/scoped_ptr.h"
 #include "base/memory/shared_memory.h"
 #include "base/process/process.h"
 #include "build/build_config.h"
@@ -136,7 +137,7 @@ class PPAPI_PROXY_EXPORT ProxyChannel
 
   // Will be null for some tests when there is a test_sink_, and if the
   // remote side has crashed.
-  scoped_ptr<IPC::SyncChannel> channel_;
+  std::unique_ptr<IPC::SyncChannel> channel_;
 
   DISALLOW_COPY_AND_ASSIGN(ProxyChannel);
 };