src: modernized unique_ptr construction

PR-URL: #31654
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Gus Caplan <me@gus.host>
Reviewed-By: David Carlier <devnexen@gmail.com>
Reviewed-By: Franziska Hinkelmann <franziska.hinkelmann@gmail.com>
Reviewed-By: Tiancheng "Timothy" Gu <timothygu99@gmail.com>

src/debug_utils.cc

@@ -100,16 +100,14 @@ class PosixSymbolDebuggingContext final : public NativeSymbolDebuggingContext {
 
 std::unique_ptr<NativeSymbolDebuggingContext>
 NativeSymbolDebuggingContext::New() {
-  return std::unique_ptr<NativeSymbolDebuggingContext>(
-      new PosixSymbolDebuggingContext());
+  return std::make_unique<PosixSymbolDebuggingContext>();
 }
 
 #else  // HAVE_EXECINFO_H
 
 std::unique_ptr<NativeSymbolDebuggingContext>
 NativeSymbolDebuggingContext::New() {
-  return std::unique_ptr<NativeSymbolDebuggingContext>(
-      new NativeSymbolDebuggingContext());
+  return std::make_unique<NativeSymbolDebuggingContext>();
 }
 
 #endif  // HAVE_EXECINFO_H