Use split_static_library in GN build.

chrome/browser/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("//build/config/chrome_build.gni")
 import("//build/config/crypto.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
+import("//build/split_static_library.gni")
 import("//chrome/common/features.gni")
 import("//media/media_options.gni")
 import("//third_party/protobuf/proto_library.gni")
 
 # //build/config/android/rules.gni imports //tools/grit/grit_rule.gni, which
 # produces a conflict for the "grit" template so we have to only include one.
 if (is_android) {
   import("//build/config/android/rules.gni")
 } else {
   import("//tools/grit/grit_rule.gni")
@@ skipping 52 matching lines @@
   # ADDITIONALLY add this config on top of ":gnome_keyring". pkg-config is a
   # bit slow, so prefer not to run it again. In practice, gnome-keyring's libs
   # are just itself and common gnome ones we link already, so we can get away
   # with additionally just coding the library name here.
   config("gnome_keyring_direct") {
     libs = [ "gnome-keyring" ]
   }
 }
 
 # Use a static library here because many test binaries depend on this but don't
-# require many files from it. This makes linking more efficient. However, on
-# Windows official builds the static library will be too large (> 32-bits) so
-# use source sets in that case.
-if (is_win && is_official_build) {
-  chrome_browser_target_type = "source_set"
-} else {
-  chrome_browser_target_type = "static_library"
-}
-target(chrome_browser_target_type, "browser") {
+# require many files from it. This makes linking more efficient.
+split_static_library("browser") {
+  # Split into multiple static libraries on Windows official builds, where we
+  # run into a 2GB max size limit.
+  if (is_win && is_official_build) {
+    split_count = 5
+  } else {
+    split_count = 1
+  }
+
   configs += [
     "//build/config/compiler:wexit_time_destructors",
     "//build/config:precompiled_headers",
     "//third_party/WebKit/public:debug_devtools",
   ]
   defines = []
   sources = []
   libs = []
   ldflags = []
 
@@ skipping 1261 matching lines @@
   # linking all of the test support.
   source_set("pepper_cdm_test_constants") {
     testonly = true
     visibility = [ "//chrome/*" ]
     sources = [
       "media/pepper_cdm_test_constants.cc",
       "media/pepper_cdm_test_constants.h",
     ]
   }
 }