Convert //chromecast from scoped_ptr to std::unique_ptr

chromecast/common/media/shared_memory_chunk.cc

Index: chromecast/common/media/shared_memory_chunk.cc
diff --git a/chromecast/common/media/shared_memory_chunk.cc b/chromecast/common/media/shared_memory_chunk.cc
index 885b0e1a56016fa3e41230ff8b868654c3cd316e..fd83ea927ae559e6b902c2d129a3ea1578799151 100644
--- a/chromecast/common/media/shared_memory_chunk.cc
+++ b/chromecast/common/media/shared_memory_chunk.cc
@@ -11,8 +11,9 @@
 namespace chromecast {
 namespace media {
 
-SharedMemoryChunk::SharedMemoryChunk(scoped_ptr<base::SharedMemory> shared_mem,
-                                     size_t size)
+SharedMemoryChunk::SharedMemoryChunk(
+    std::unique_ptr<base::SharedMemory> shared_mem,
+    size_t size)
     : shared_mem_(std::move(shared_mem)), size_(size) {}
 
 SharedMemoryChunk::~SharedMemoryChunk() {