Compile FileCache related files only on Chrome OS.

chrome/browser/chromeos/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/features.gni")
 import("//build/config/ui.gni")
 import("//chrome/chrome_tests.gni")
 import("//media/media_options.gni")
 import("//third_party/protobuf/proto_library.gni")
 
@@ skipping 44 matching lines @@
     "//chrome/installer/util:with_no_strings",
     "//chromeos",
     "//chromeos:cryptohome_proto",
     "//chromeos:cryptohome_signkey_proto",
     "//chromeos:power_manager_proto",
     "//chromeos/ime:gencode",
     "//components/arc",
     "//components/certificate_reporting:cert_logger_proto",
     "//components/certificate_reporting:encrypted_cert_logger_proto",
     "//components/drive",
+    "//components/drive:drive_chromeos",
     "//components/flags_ui",
     "//components/login",
     "//components/onc",
     "//components/ownership",
     "//components/pairing",
     "//components/policy",
     "//components/proxy_config",
     "//components/session_manager/core",
     "//components/user_manager",
     "//components/wifi_sync",
@@ skipping 95 matching lines @@
           "//chrome")
 
   public_deps = [
     ":chromeos",
   ]
   deps = [
     ":attestation_proto",
     ":device_policy_proto",
     "//ash/resources",
     "//components/drive",
+    "//components/drive:test_support_chromeos",
     "//components/invalidation/public",
     "//components/policy",
     "//components/resources",
     "//crypto:platform",
     "//dbus",
     "//mojo/public/cpp/system:system",
     "//skia",
     "//sync",
     "//testing/gmock",
     "//testing/gtest",
     "//third_party/leveldatabase",
     "//ui/chromeos/resources",
   ]
 }
 
 proto_library("device_policy_proto") {
   sources = [
     "policy/proto/chrome_device_policy.proto",
     "policy/proto/install_attributes.proto",
   ]
 }
 
 proto_library("attestation_proto") {
   sources = [
     "attestation/attestation_key_payload.proto",
     "attestation/attestation_signed_data.proto",
   ]
 }