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

BUILD.gn

Index: BUILD.gn
diff --git a/BUILD.gn b/BUILD.gn
index f06d672dd5869d691e330cea4823485550957baa..350e87b0914b941439133048036dc87cdcd4426b 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -639,10 +639,6 @@ group("both_gn_and_gyp") {
       if (!is_debug && !is_component_build) {
         deps += [ "//chrome/tools/service_discovery_sniffer" ]
       }
-
-      if (is_clang) {
-        deps += [ "//build/sanitizers:copy_llvm_symbolizer" ]
-      }
     }
 
     if (use_x11) {
@@ -1040,9 +1036,6 @@ if (!is_ios && !is_android && !is_chromecast) {
         "//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",