convert //gpu to std::unique_ptr

gpu/command_buffer/client/mapped_memory.h

Index: gpu/command_buffer/client/mapped_memory.h
diff --git a/gpu/command_buffer/client/mapped_memory.h b/gpu/command_buffer/client/mapped_memory.h
index 7083159904554b6b2d886204c0e9eb8d84ca53f5..0af38b56e92f02b92043fd0e286e3fc9b6108fa0 100644
--- a/gpu/command_buffer/client/mapped_memory.h
+++ b/gpu/command_buffer/client/mapped_memory.h
@@ -8,9 +8,10 @@
 #include <stddef.h>
 #include <stdint.h>
 
+#include <memory>
+
 #include "base/bind.h"
 #include "base/macros.h"
-#include "base/memory/scoped_ptr.h"
 #include "base/trace_event/memory_dump_provider.h"
 #include "gpu/command_buffer/client/fenced_allocator.h"
 #include "gpu/command_buffer/common/buffer.h"
@@ -201,7 +202,7 @@ class GPU_EXPORT MappedMemoryManager
   }
 
  private:
-  typedef std::vector<scoped_ptr<MemoryChunk>> MemoryChunkVector;
+  typedef std::vector<std::unique_ptr<MemoryChunk>> MemoryChunkVector;
 
   // size a chunk is rounded up to.
   unsigned int chunk_size_multiple_;