Build third_party/zlib/google only when build_with_chromium is true.

third_party/zlib/BUILD.gn

 # Copyright (c) 2013 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_overrides/build.gni")
+
 config("zlib_config") {
   include_dirs = [ "." ]
 }
 
 static_library("zlib_x86_simd") {
   if (!is_ios && (current_cpu == "x86" || current_cpu == "x64")) {
     sources = [
       "crc_folding.c",
       "fill_window_sse.c",
     ]
@@ skipping 113 matching lines @@
   configs -= [ "//build/config/compiler:chromium_code" ]
   configs += [
     "//build/config/compiler:no_chromium_code",
 
     # Must be after no_chromium_code for warning flags to be ordered correctly.
     ":minizip_warnings",
   ]
   public_configs = [ ":zlib_config" ]
 }
 
-static_library("zip") {
-  sources = [
-    "google/zip.cc",
-    "google/zip.h",
-    "google/zip_internal.cc",
-    "google/zip_internal.h",
-    "google/zip_reader.cc",
-    "google/zip_reader.h",
-  ]
-  deps = [
-    ":minizip",
-    "//base",
-  ]
+if (build_with_chromium) {
+  static_library("zip") {
+    sources = [
+      "google/zip.cc",
+      "google/zip.h",
+      "google/zip_internal.cc",
+      "google/zip_internal.h",
+      "google/zip_reader.cc",
+      "google/zip_reader.h",
+    ]
+    deps = [
+      ":minizip",
+      "//base",
+    ]
+  }
+
+  static_library("compression_utils") {
+    sources = [
+      "google/compression_utils.cc",
+      "google/compression_utils.h",
+    ]
+    deps = [
+      ":zlib",
+    ]
+  }
 }
-
-static_library("compression_utils") {
-  sources = [
-    "google/compression_utils.cc",
-    "google/compression_utils.h",
-  ]
-  deps = [
-    ":zlib",
-  ]
-}