Replace SmartPointer<T> with unique_ptr<T>

src/profiler/sampling-heap-profiler.h

Index: src/profiler/sampling-heap-profiler.h
diff --git a/src/profiler/sampling-heap-profiler.h b/src/profiler/sampling-heap-profiler.h
index 4b7c366b8078a7df724603f7969d5e5912c410e3..07840244ce5e916bdafda0071b38bbe781e5a122 100644
--- a/src/profiler/sampling-heap-profiler.h
+++ b/src/profiler/sampling-heap-profiler.h
@@ -7,6 +7,7 @@
 
 #include <deque>
 #include <map>
+#include <memory>
 #include <set>
 #include "include/v8-profiler.h"
 #include "src/heap/heap.h"
@@ -141,8 +142,8 @@ class SamplingHeapProfiler {
 
   Isolate* const isolate_;
   Heap* const heap_;
-  base::SmartPointer<SamplingAllocationObserver> new_space_observer_;
-  base::SmartPointer<SamplingAllocationObserver> other_spaces_observer_;
+  std::unique_ptr<SamplingAllocationObserver> new_space_observer_;
+  std::unique_ptr<SamplingAllocationObserver> other_spaces_observer_;
   StringsStorage* const names_;
   AllocationNode profile_root_;
   std::set<Sample*> samples_;
@@ -151,6 +152,8 @@ class SamplingHeapProfiler {
   v8::HeapProfiler::SamplingFlags flags_;
 
   friend class SamplingAllocationObserver;
+
+  DISALLOW_COPY_AND_ASSIGN(SamplingHeapProfiler);
 };
 
 class SamplingAllocationObserver : public AllocationObserver {