Replace SmartPointer<T> with unique_ptr<T>

src/snapshot/code-serializer.cc

 // Copyright 2016 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/snapshot/code-serializer.h"
 
+#include <memory>
+
 #include "src/code-stubs.h"
 #include "src/log.h"
 #include "src/macro-assembler.h"
 #include "src/snapshot/deserializer.h"
 #include "src/version.h"
 
 namespace v8 {
 namespace internal {
 
 ScriptData* CodeSerializer::Serialize(Isolate* isolate,
@@ skipping 130 matching lines @@
   PutAttachedReference(reference, how_to_code, where_to_point);
 }
 
 MaybeHandle<SharedFunctionInfo> CodeSerializer::Deserialize(
     Isolate* isolate, ScriptData* cached_data, Handle<String> source) {
   base::ElapsedTimer timer;
   if (FLAG_profile_deserialization) timer.Start();
 
   HandleScope scope(isolate);
 
-  base::SmartPointer<SerializedCodeData> scd(
+  std::unique_ptr<SerializedCodeData> scd(
       SerializedCodeData::FromCachedData(isolate, cached_data, *source));
-  if (scd.is_empty()) {
+  if (!scd) {
     if (FLAG_profile_deserialization) PrintF("[Cached code failed check]\n");
     DCHECK(cached_data->rejected());
     return MaybeHandle<SharedFunctionInfo>();
   }
 
   Deserializer deserializer(scd.get());
   deserializer.AddAttachedObject(source);
   Vector<const uint32_t> code_stub_keys = scd->CodeStubKeys();
   for (int i = 0; i < code_stub_keys.length(); i++) {
     deserializer.AddAttachedObject(
@@ skipping 186 matching lines @@
   SanityCheckResult r = scd->SanityCheck(isolate, source);
   if (r == CHECK_SUCCESS) return scd;
   cached_data->Reject();
   source->GetIsolate()->counters()->code_cache_reject_reason()->AddSample(r);
   delete scd;
   return NULL;
 }
 
 }  // namespace internal
 }  // namespace v8