Redefine is_linux to not include Android in the GN build.

tools/gn/secondary/chrome/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("//crypto/ssl/flags.gni")
 import("//tools/grit/grit_rule.gni")
 
 executable("chrome") {
   sources = [
     "app/breakpad_field_trial_win.cc",
@@ skipping 48 matching lines @@
       "app/client_util.cc",
       "app/client_util.h",
     ]
   }
 }
 
 static_library("browser") {
   external = true
 
   if (is_linux) {
-    libs = [ "dl" ]
     if (toolkit_uses_gtk) {
-      libs += [ "gconf-2" ]
+      libs = [ "gconf-2" ]
     }
   }
   if (is_linux) {
     configs += [
       "//build/config/linux:x11",
     ]
   }
 
   deps = [
     "//third_party/expat",
@@ skipping 219 matching lines @@
 #    ":theme_resources_gen",
 #    #"//ui:ui_resources",
 #  ]
 #}
 #
 ## TODO(brettw) rename "app_theme_resources" or something when we don't support
 ## GYP any more. This name is required to match the GYP build.
 #grit("theme_resources_gen") {
 #  source = "app/theme/theme_resources.grd"
 #}