Revert of Replace slots buffer with remembered set.

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/mips.gni")
 import("//build/config/sanitizers/sanitizers.gni")
 
 if (is_android) {
@@ skipping 1055 matching lines @@
     "src/heap/objects-visiting.cc",
     "src/heap/objects-visiting.h",
     "src/heap/remembered-set.cc",
     "src/heap/remembered-set.h",
     "src/heap/scavenge-job.h",
     "src/heap/scavenge-job.cc",
     "src/heap/scavenger-inl.h",
     "src/heap/scavenger.cc",
     "src/heap/scavenger.h",
     "src/heap/slot-set.h",
+    "src/heap/slots-buffer.cc",
+    "src/heap/slots-buffer.h",
     "src/heap/spaces-inl.h",
     "src/heap/spaces.cc",
     "src/heap/spaces.h",
     "src/heap/store-buffer-inl.h",
     "src/heap/store-buffer.cc",
     "src/heap/store-buffer.h",
     "src/i18n.cc",
     "src/i18n.h",
     "src/icu_util.cc",
     "src/icu_util.h",
@@ skipping 902 matching lines @@
   ]
 
   configs -= [ "//build/config/compiler:chromium_code" ]
   configs += [ "//build/config/compiler:no_chromium_code" ]
   configs += [
     ":internal_config",
     ":features",
     ":toolchain",
   ]
 }