GN: Use gold linker for arm64

build/config/BUILD.gn

 # Copyright (c) 2013 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/allocator.gni")
 import("//build/config/chrome_build.gni")
 import("//build/config/chromecast_build.gni")
 import("//build/config/crypto.gni")
 import("//build/config/features.gni")
 import("//build/config/sanitizers/sanitizers.gni")
@@ skipping 347 matching lines @@
       "ws2_32.lib",
 
       # Please don't add more stuff here. We should actually be making this
       # list smaller, since all common things should be covered. If you need
       # some extra libraries, please just add a libs = [ "foo.lib" ] to your
       # target that needs it.
     ]
   } else if (is_android) {
     # Android uses -nostdlib so we need to add even libc here.
     libs = [
-      # TODO(brettw) write a version of this, hopefully we can express this
-      # without forking out to GCC just to get the library name. The android
-      # toolchain directory should probably be extracted into a .gni file that
-      # this file and the android toolchain .gn file can share.
-      #   # Manually link the libgcc.a that the cross compiler uses.
-      #   '<!(<(android_toolchain)/*-gcc -print-libgcc-file-name)',
       "c",
       "dl",
       "m",
     ]
   } else if (is_mac) {
     libs = [
       "AppKit.framework",
       "ApplicationServices.framework",
       "Carbon.framework",
       "CoreFoundation.framework",
@@ skipping 93 matching lines @@
     # This error doesn't happen every time. In VS2013, it seems if the .pch
     # file doesn't exist, no error will be generated (probably MS tested this
     # case but forgot the other one?). To reproduce this error, do a build,
     # then delete the precompile.c.obj file, then build again.
     cflags_c = [ "/wd4206" ]
   } else if (is_mac && !is_official_build && !use_goma) {
     precompiled_header = "build/precompile.h"
     precompiled_source = "//build/precompile.h"
   }
 }