convert //gpu to std::unique_ptr

gpu/command_buffer/service/texture_manager.h

Index: gpu/command_buffer/service/texture_manager.h
diff --git a/gpu/command_buffer/service/texture_manager.h b/gpu/command_buffer/service/texture_manager.h
index 2485146677adff6954f45c6546ebc696ad37ed64..2ebe16ea70a728b794ed48bd94e05741ced443d0 100644
--- a/gpu/command_buffer/service/texture_manager.h
+++ b/gpu/command_buffer/service/texture_manager.h
@@ -10,9 +10,11 @@
 
 #include <algorithm>
 #include <list>
+#include <memory>
 #include <set>
 #include <string>
 #include <vector>
+
 #include "base/containers/hash_tables.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
@@ -1083,7 +1085,7 @@ class GPU_EXPORT TextureManager : public base::trace_event::MemoryDumpProvider {
                       TextureRef* ref);
 
   MemoryTypeTracker* GetMemTracker();
-  scoped_ptr<MemoryTypeTracker> memory_type_tracker_;
+  std::unique_ptr<MemoryTypeTracker> memory_type_tracker_;
   MemoryTracker* memory_tracker_;
 
   scoped_refptr<FeatureInfo> feature_info_;