build: Remove build system support for gold plugin, except under ChromeOS.

tools/win/DebugVisualizers/BUILD.gn

 # Copyright 2017 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.
 
 # The .natvis files define "native visualizers" for the Visual Studio debugger
 # that allow one to define how custom types appear.
 #
 # One can use them by adding them to a project in visual studio, and they can
 # be embedded in a project's PDB file using the undocumented linker flag
 # /NATVIS. These configs would generally be added to all_dependent_configs
 # on a target so all targets that link to them will reference the visualizers
 # from their PDB files.
 #
 # See https://msdn.microsoft.com/en-us/library/jj620914.aspx for how they work.
 #
 # Since these only add ldflags, the targets themselves are not rebuilt when the
 # natvis files are updated. To debug, erase the .pdb file and build to re-link.
 
-import("//build/toolchain/toolchain.gni")
+import("//build/config/compiler/compiler.gni")
 
 assert(is_win)
 
 config("chrome") {
   # TODO(tikuta): remove this condition if lld supports /NATVIS.
   if (!use_lld) {
     ldflags = [ "/NATVIS:" + rebase_path("chrome.natvis", root_build_dir) ]
   }
 }
 
 config("skia") {
   # TODO(tikuta): remove this condition if lld supports /NATVIS.
   if (!use_lld) {
     ldflags = [ "/NATVIS:" + rebase_path("skia.natvis", root_build_dir) ]
   }
 }
 
 config("webkit") {
   # TODO(tikuta): remove this condition if lld supports /NATVIS.
   if (!use_lld) {
     ldflags = [ "/NATVIS:" + rebase_path("webkit.natvis", root_build_dir) ]
   }
 }