Remove the experimental perf jit support until the license is clarified.

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")
 
 # Because standalone V8 builds are not supported, assume this is part of a
 # Chromium build.
@@ skipping 952 matching lines @@
     "src/objects.h",
     "src/optimizing-compile-dispatcher.cc",
     "src/optimizing-compile-dispatcher.h",
     "src/ostreams.cc",
     "src/ostreams.h",
     "src/pattern-rewriter.cc",
     "src/parser.cc",
     "src/parser.h",
     "src/pending-compilation-error-handler.cc",
     "src/pending-compilation-error-handler.h",
-    "src/perf-jit.cc",
-    "src/perf-jit.h",
     "src/preparse-data-format.h",
     "src/preparse-data.cc",
     "src/preparse-data.h",
     "src/preparser.cc",
     "src/preparser.h",
     "src/prettyprinter.cc",
     "src/prettyprinter.h",
     "src/profile-generator-inl.h",
     "src/profile-generator.cc",
     "src/profile-generator.h",
@@ skipping 690 matching lines @@
       sources += [
         "src/d8-debug.cc",
         "$target_gen_dir/d8-js.cc",
       ]
     }
     if (v8_enable_i18n_support) {
       deps += [ "//third_party/icu" ]
     }
   }
 }