Fix building NaCl in Linux component GN builds.

build/config/BUILDCONFIG.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.
 
 # =============================================================================
 # BUILD FLAGS
 # =============================================================================
 #
 # This block lists input arguments to the build, along with their default
 # values. GN requires listing them explicitly so it can validate input and have
@@ skipping 141 matching lines @@
   # It is not set by default or on the command line. We treat is as a
   # Posix variant.
   is_android = false
   is_chromeos = false
   is_ios = false
   is_linux = false
   is_mac = false
   is_nacl = true
   is_posix = true
   is_win = false
+
+  # Component build never makes sense for the nacl toolchains.
+  is_component_build = false
 } else if (current_os == "ios") {
   is_android = false
   is_chromeos = false
   is_ios = true
   is_linux = false
   is_mac = false
   is_nacl = false
   is_posix = true
   is_win = false
 } else if (current_os == "linux") {
@@ skipping 546 matching lines @@
       }
       if (defined(invoker.testonly)) {
         testonly = invoker.testonly
       }
       if (defined(invoker.visibility)) {
         visibility = invoker.visibility
       }
     }
   }
 }