Pull ICU, rename component build GN variables.

net/third_party/nss/ssl/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.
 
 config("ssl_config") {
   include_dirs = [ "." ]
 
   if (is_mac || is_win) {
     defines = [ "NSS_PLATFORM_CLIENT_AUTH" ]
   }
@@ skipping 56 matching lines @@
   ]
 
   configs -= [ "//build/config/compiler:chromium_code" ]
   configs += [ "//build/config/compiler:no_chromium_code" ]
 
   if (is_win) {
     sources -= [
       "unix_err.c",
       "unix_err.h",
     ]
-    if (component_mode == "shared_library") {
+    if (is_component_build) {
       ldflags = [ "/DEF:" + rebase_path("exports_win.def", root_build_dir) ]
     }
   } else if (is_linux) {
-    if (component_mode == "shared_library") {
+    if (is_component_build) {
       configs -= [ "//build/config/gcc:symbol_visibility_hidden" ]
     }
 
     libs = [ "dl" ]
 
     include_dirs = [ "bodge" ]
 
     # Must be after ssl_config since we want our SSL headers to take
     # precedence.
     public_configs += [ "//third_party/nss:system_nss_no_ssl_config" ]
@@ skipping 30 matching lines @@
     public_deps = [
       "//third_party/nss:nspr",
       "//third_party/nss:nss",
     ]
   }
 
   if (is_debug) {
     defines += [ "DEBUG" ]
   }
 }