Make base a static ibrary

sandbox/win/BUILD.gn

 # Copyright 2014 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("//testing/test.gni")
 
-source_set("sandbox") {
+# This needs to be a static library rather than a sources set because small
+# portions of this are used in some contexts (like chrome_elf), and it
+# doesnn't seem to dead-code strip very well. This saves 12K on chrome_elf.dll,
+# over a source set, for example.
+static_library("sandbox") {
   sources = [
     "src/acl.cc",
     "src/acl.h",
     "src/app_container.cc",
     "src/app_container.h",
     "src/broker_services.cc",
     "src/broker_services.h",
     "src/crosscall_client.h",
     "src/crosscall_params.h",
     "src/crosscall_server.cc",
@@ skipping 283 matching lines @@
     "sandbox_poc/pocdll/spyware.cc",
     "sandbox_poc/pocdll/utils.h",
   ]
 
   defines = [ "POCDLL_EXPORTS" ]
 
   deps = [
     "//build/config/sanitizers:deps",
   ]
 }