Remove step that copies llvm-symbolizer to the root build dir.

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.
 
 # This is the root build file for GN. GN will start processing by loading this
 # file, and recursively load all dependencies until all dependencies are either
 # resolved or known not to exist (which will cause the build to fail). So if
 # you add a new build file, there must be some path of dependencies from this
 # file to your new one or GN won't know about it.
 
@@ skipping 621 matching lines @@
         "//skia:image_operations_bench",
         "//third_party/sqlite:sqlite_shell",
         "//ui/keyboard:keyboard_unittests",
         "//ui/message_center:message_center_unittests",
         "//ui/snapshot:snapshot_unittests",
       ]
 
       if (!is_debug && !is_component_build) {
         deps += [ "//chrome/tools/service_discovery_sniffer" ]
       }
-
-      if (is_clang) {
-        deps += [ "//build/sanitizers:copy_llvm_symbolizer" ]
-      }
     }
 
     if (use_x11) {
       if (target_cpu != "arm") {
         deps += [ "//gpu/tools/compositor_model_bench" ]
       }
     }
   }
 
   if (is_mac) {
@@ skipping 377 matching lines @@
     }
     if (enable_ipc_fuzzer && !is_component_build) {
       deps += [ "//tools/ipc_fuzzer:ipc_fuzzer_all" ]
     }
     if (!is_chromeos) {
       deps += [
         "//third_party/pdfium/samples:pdfium_test",
         "//v8:v8_shell($v8_snapshot_toolchain)",
       ]
     }
-    if (is_clang) {
-      deps += [ "//build/sanitizers:copy_llvm_symbolizer" ]
-    }
     if (is_win && symbol_level == 2 && target_cpu == "x86" && is_syzyasan) {
       deps += [
         "//chrome/tools/build/win/syzygy:chrome_dll_syzygy",
         "//content/shell:content_shell_syzyasan",
       ]
     }
   }
 }
 
 # For compatibility with GYP. The linux_chromium_chromeos_rel_ng and
@@ skipping 41 matching lines @@
   assert(target_name != "")  # Mark as used.
   sources = invoker.actual_sources
   assert(
       sources == invoker.actual_sources,
       "Do not use a platform name in your output directory (found \"$root_build_dir\"). http://crbug.com/548283")
 }
 
 assert_valid_out_dir("_unused") {
   actual_sources = [ "$root_build_dir/foo" ]
 }