Split ui.lib to avoid hitting 4 GB limit

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")
@@ skipping 38 matching lines @@
       "/DELAYLOAD:ndfapi.dll",
       "/DELAYLOAD:pdh.dll",  # The task manager is rarely used.
     ]
   }
 }
 
 # 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.
 split_static_library("browser") {
   # Split into multiple static libraries on Windows builds. We have hit size
-  # on Windows official builds and on goma builds symbol_level = 2 is selected.
-  # Always splitting on Windows builds is simpler than trying to perfectly
-  # calculate the scenarios where it is required.
+  # limits on Windows official builds and on goma builds when symbol_level = 2
+  # is selected. Always splitting on Windows builds is simpler than trying to
+  # perfectly calculate the scenarios where it is required.
   if (is_win) {
     split_count = 5
   } else {
     split_count = 1
   }
 
   sources = [
     "about_flags.cc",
     "about_flags.h",
     "after_startup_task_utils.cc",
@@ skipping 4516 matching lines @@
       "media/pepper_cdm_test_constants.cc",
       "media/pepper_cdm_test_constants.h",
     ]
   }
 }
 
 service_manifest("preferences_manifest") {
   name = "preferences"
   source = "prefs/preferences_manifest.json"
 }