Replace SmartArrayPointer<T> with unique_ptr<T[]>

src/string-stream.h

Index: src/string-stream.h
diff --git a/src/string-stream.h b/src/string-stream.h
index 03ea0620ad2f240fd977b8338b51b1124e087b8b..75b3db4b489ae70541ec29132e0f3daf9a3864ab 100644
--- a/src/string-stream.h
+++ b/src/string-stream.h
@@ -5,6 +5,8 @@
 #ifndef V8_STRING_STREAM_H_
 #define V8_STRING_STREAM_H_
 
+#include <memory>
+
 #include "src/allocation.h"
 #include "src/base/smart-pointers.h"
 #include "src/handles.h"
@@ -135,7 +137,7 @@ class StringStream final {
   void OutputToStdOut() { OutputToFile(stdout); }
   void Log(Isolate* isolate);
   Handle<String> ToString(Isolate* isolate);
-  base::SmartArrayPointer<const char> ToCString() const;
+  std::unique_ptr<char[]> ToCString() const;
   int length() const { return length_; }
 
   // Object printing support.