Convert //media/audio from scoped_ptr to std::unique_ptr

media/audio/alsa/alsa_output.cc

Index: media/audio/alsa/alsa_output.cc
diff --git a/media/audio/alsa/alsa_output.cc b/media/audio/alsa/alsa_output.cc
index 9216def5e2d6b70a3fc88e113688c8e5db9c6333..c127fb4c2e93a9c6bfd000e41b9717bd181681e1 100644
--- a/media/audio/alsa/alsa_output.cc
+++ b/media/audio/alsa/alsa_output.cc
@@ -561,13 +561,13 @@ std::string AlsaPcmOutputStream::FindDeviceForChannels(uint32_t channels) {
     for (void** hint_iter = hints; *hint_iter != NULL; hint_iter++) {
       // Only examine devices that are output capable..  Valid values are
       // "Input", "Output", and NULL which means both input and output.
-      scoped_ptr<char, base::FreeDeleter> io(
+      std::unique_ptr<char, base::FreeDeleter> io(
           wrapper_->DeviceNameGetHint(*hint_iter, kIoHintName));
       if (io != NULL && strcmp(io.get(), "Input") == 0)
         continue;
 
       // Attempt to select the closest device for number of channels.
-      scoped_ptr<char, base::FreeDeleter> name(
+      std::unique_ptr<char, base::FreeDeleter> name(
           wrapper_->DeviceNameGetHint(*hint_iter, kNameHintName));
       if (strncmp(wanted_device, name.get(), strlen(wanted_device)) == 0) {
         guessed_device = name.get();