Remove libc++abi dependency on mac

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/host_byteorder.gni")
 import("//third_party/icu/config.gni")
 
 if (is_android) {
   import("//build/config/android/rules.gni")
 }
@@ skipping 927 matching lines @@
     "source/common/unicode/utrace.h",
     "source/common/unicode/utypes.h",
     "source/common/unicode/uvernum.h",
     "source/common/unicode/uversion.h",
   ]
   defines = [ "U_COMMON_IMPLEMENTATION" ]
   deps = [
     ":icudata",
   ]
 
-  if (is_mac && using_sanitizer) {
-    deps += [ "//buildtools/third_party/libc++abi" ]
-  }
-
   configs -= [
     "//build/config/compiler:no_rtti",  # ICU uses RTTI.
     "//build/config/compiler:chromium_code",
   ]
   configs += [
     "//build/config/compiler:rtti",
     "//build/config/compiler:no_chromium_code",
   ]
   configs += [ ":icu_code" ]
 
@@ skipping 76 matching lines @@
       }
     }
 
     source_set("icudata") {
       sources = [ "$data_assembly" ]
       defines = [ "U_HIDE_DATA_SYMBOL" ]
       deps = [ ":make_data_assembly", ]
     }
   }
 }