Replace SmartPointer<T> with unique_ptr<T>

BUILD.gn

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("//build/config/android/config.gni")
 import("//build/config/arm.gni")
 import("//build/config/dcheck_always_on.gni")
 import("//build/config/mips.gni")
 import("//build/config/sanitizers/sanitizers.gni")
 
@@ skipping 2022 matching lines @@
     "src/base/platform/mutex.h",
     "src/base/platform/platform.h",
     "src/base/platform/semaphore.cc",
     "src/base/platform/semaphore.h",
     "src/base/platform/time.cc",
     "src/base/platform/time.h",
     "src/base/safe_conversions.h",
     "src/base/safe_conversions_impl.h",
     "src/base/safe_math.h",
     "src/base/safe_math_impl.h",
-    "src/base/smart-pointers.h",
     "src/base/sys-info.cc",
     "src/base/sys-info.h",
     "src/base/utils/random-number-generator.cc",
     "src/base/utils/random-number-generator.h",
   ]
 
   configs = [ ":internal_config_base" ]
 
   defines = []
 
@@ skipping 452 matching lines @@
 
   deps = [
     ":fuzzer_support",
   ]
 
   configs = [ ":internal_config" ]
 }
 
 v8_fuzzer("wasm_asmjs_fuzzer") {
 }