Compile FileCache related files only on Chrome OS.

chrome/browser/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("//build/config/chrome_build.gni")
 import("//build/config/crypto.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//chrome/common/features.gni")
 import("//media/media_options.gni")
@@ skipping 1265 matching lines @@
       "extensions/test_extension_service.h",
       "extensions/test_extension_system.cc",
       "extensions/test_extension_system.h",
       "media_galleries/media_galleries_test_util.cc",
       "media_galleries/media_galleries_test_util.h",
     ]
     deps += [
       "//components/drive:test_support",
       "//components/storage_monitor:test_support",
     ]
+
+    if (is_chromeos) {
+      deps += [ "//components/drive:test_support_chromeos" ]

[hashimoto, 2016/01/22 06:29:47]

Can't this be also moved to chrome/browser/chromeos/BUILD.gn?

[yawano, 2016/01/22 06:43:56]

Done.

+    }
   }
 
   if (enable_mdns) {
     sources += [
       "local_discovery/test_service_discovery_client.cc",
       "local_discovery/test_service_discovery_client.h",
     ]
   }
 
   if (enable_app_list) {
@@ skipping 38 matching lines @@
         rebase_path(gypi_values.chrome_browser_rlz_sources, ".", "//chrome")
     deps = [
       "//components/google/core/browser",
       "//components/omnibox/browser",
       "//components/rlz",
       "//components/search_engines",
       "//rlz:rlz_lib",
     ]
   }
 }