Update unicode to 7.0.0.

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.
 
 # TODO(jochen): These will need to be user-settable to support standalone V8
 # builds.
 v8_compress_startup_data = "off"
 v8_deprecation_warnings = false
 v8_enable_disassembler = false
 v8_enable_gdbjit = false
@@ skipping 877 matching lines @@
     "src/types-inl.h",
     "src/types.cc",
     "src/types.h",
     "src/typing.cc",
     "src/typing.h",
     "src/unbound-queue-inl.h",
     "src/unbound-queue.h",
     "src/unicode-inl.h",
     "src/unicode.cc",
     "src/unicode.h",
+    "src/unicode-decoder.cc",
+    "src/unicode-decoder.h",
     "src/unique.h",
     "src/uri.h",
     "src/utils-inl.h",
     "src/utils.cc",
     "src/utils.h",
     "src/v8.cc",
     "src/v8.h",
     "src/v8memory.h",
     "src/v8threads.cc",
     "src/v8threads.h",
@@ skipping 516 matching lines @@
     deps = [
       ":v8_base",
       ":v8_nosnapshot",
     ]
   }
 
   direct_dependent_configs = [ ":external_config" ]
 }
 
 }