Set enable_app_list=1 now only on ChromeOS.

ash/resources/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("//tools/grit/grit_rule.gni")
 import("//tools/grit/repack.gni")
 import("//ui/base/ui_features.gni")
 
 assert(enable_hidpi)
 
@@ skipping 26 matching lines @@
       ]
     }
 
     deps = [
       "//ash/resources",
       "//content:resources",
       "//ui/resources",
     ]
 
     if (toolkit_views) {
-      deps += [ "//ui/views/resources" ]
-      sources += [ "$root_gen_dir/ui/views/resources/views_resources_${percent}_percent.pak" ]
+      deps += [
+        "//ui/app_list/resources",
+        "//ui/views/resources",
+      ]
+      sources += [
+        "$root_gen_dir/ui/app_list/resources/app_list_resources_${percent}_percent.pak",
+        "$root_gen_dir/ui/views/resources/views_resources_${percent}_percent.pak",
+      ]
 
       if (percent == "100") {
         # TODO(msw): This seems bad, but follows repack_ui_test_pak's example.
         deps += [ "//third_party/WebKit/public:resources_grit" ]
         sources +=
             [ "$root_gen_dir/blink/public/resources/blink_resources.pak" ]
       }
     }
 
     if (is_chromeos) {
       sources += [ "$root_gen_dir/ui/chromeos/resources/ui_chromeos_resources_${percent}_percent.pak" ]
       deps += [ "//ui/chromeos/resources" ]
     }
-
-    if (enable_app_list) {
-      sources += [ "$root_gen_dir/ui/app_list/resources/app_list_resources_${percent}_percent.pak" ]
-      deps += [ "//ui/app_list/resources" ]
-    }
   }
 }
 
 ash_test_resources("100_percent") {
   percent = "100"
 }
 
 ash_test_resources("200_percent") {
   percent = "200"
 }