Use split_static_library in GN build.

chrome/browser/BUILD.gn

Index: chrome/browser/BUILD.gn
diff --git a/chrome/browser/BUILD.gn b/chrome/browser/BUILD.gn
index 717ea25a87c9201e99268c72991d1ab9fe15fd9e..822855234ed49b4eafed028c0c05c1607520fdf8 100644
--- a/chrome/browser/BUILD.gn
+++ b/chrome/browser/BUILD.gn
@@ -6,6 +6,7 @@ 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/kasko/kasko.gni")
@@ -78,20 +79,15 @@ if (is_desktop_linux) {
   }
 }
 
-# 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_mac || (is_win && is_official_build)) {
-  # TODO(brettw) bug 618797: Remove the mac condition. On Mac making this
-  # target a static_library causes a crash on startup and the browser_tests all
-  # fail. My guess is this is due to a required static initializer not being
-  # brought in.
-  chrome_browser_target_type = "source_set"
-} else {
-  chrome_browser_target_type = "static_library"
-}
-target(chrome_browser_target_type, "browser") {
+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",