Reduce chrome.exe .text size by 50 KB with static_library

third_party/brotli/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.
 
 if (is_win) {
   import("//build/config/win/visual_studio_version.gni")
 }
 
-source_set("brotli") {
+static_library("brotli") {
   sources = [
     "dec/bit_reader.c",
     "dec/bit_reader.h",
     "dec/context.h",
     "dec/decode.c",
     "dec/decode.h",
     "dec/dictionary.c",
     "dec/dictionary.h",
     "dec/huffman.c",
     "dec/huffman.h",
@@ skipping 77 matching lines @@
       cflags = [ "/wd4334" ]
     }
 
     # Always build release since this is a build tool.
     if (is_debug) {
       configs -= [ "//build/config:debug" ]
       configs += [ "//build/config:release" ]
     }
   }
 }