Revert of Crashpad Windows: Use the Crashpad client instead of Breakpad on Windows

build/secondary/third_party/crashpad/crashpad/client/BUILD.gn

 # Copyright 2015 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.
 
 config("client_config") {
   include_dirs = [ ".." ]
 }
 
 source_set("client") {
   sources = [
+    "capture_context_mac.S",
+    "capture_context_mac.h",
     "crash_report_database.cc",
     "crash_report_database.h",
     "crash_report_database_mac.mm",
     "crash_report_database_win.cc",
     "crashpad_client.h",
     "crashpad_client_mac.cc",
     "crashpad_client_win.cc",
     "crashpad_info.cc",
     "crashpad_info.h",
     "prune_crash_reports.cc",
     "prune_crash_reports.h",
     "settings.cc",
     "settings.h",
     "simple_string_dictionary.cc",
     "simple_string_dictionary.h",
     "simulate_crash.h",
     "simulate_crash_mac.cc",
     "simulate_crash_mac.h",
     "simulate_crash_win.h",
   ]
 
-  if (is_mac) {
-    sources += [
-      "capture_context_mac.S",
-      "capture_context_mac.h",
-    ]
-  }
-
   public_configs = [ ":client_config" ]
 
   deps = [
     "//base",
     "//third_party/crashpad/crashpad/compat",
     "//third_party/crashpad/crashpad/util",
   ]
 
   if (is_win) {
     libs = [ "rpcrt4.lib" ]
   }
 }