Async DNS: Don't watch hosts file on Android

net/dns/dns_config_service_posix_unittest.cc

 // Copyright (c) 2012 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.
 
 #include <resolv.h>
 
 #include "base/cancelable_callback.h"
 #include "base/files/file_util.h"
 #include "base/sys_byteorder.h"
 #include "base/test/test_timeouts.h"
@@ skipping 175 matching lines @@
   base::PlatformThread::Sleep(base::TimeDelta::FromMilliseconds(1000));
 }
 
 }  // namespace
 
 #else  // OS_ANDROID
 
 namespace internal {
 
 const char kTempHosts1[] = "127.0.0.1 localhost";
+// kTempHosts2 is only used by SeenChangeSinceHostsChange, which doesn't run
+// on Android.
+#if !defined(OS_ANDROID)
 const char kTempHosts2[] = "127.0.0.2 localhost";
+#endif  // !defined(OS_ANDROID)
 
 class DnsConfigServicePosixTest : public testing::Test {
  public:
   DnsConfigServicePosixTest() : seen_config_(false) {}
   ~DnsConfigServicePosixTest() override {}
 
   void OnConfigChanged(const DnsConfig& config) {
     EXPECT_TRUE(config.IsValid());
     seen_config_ = true;
     base::MessageLoop::current()->QuitWhenIdle();
@@ skipping 60 matching lines @@
     seen_config_ = false;
   }
 
   bool seen_config_;
   base::Time creation_time_;
   base::FilePath temp_file_;
   scoped_ptr<DnsConfigServicePosix> service_;
   DnsConfig test_config_;
 };
 
-TEST_F(DnsConfigServicePosixTest, SeenChangeSince) {
+TEST_F(DnsConfigServicePosixTest, SeenChangeSinceNetworkChange) {
   // Verify SeenChangeSince() returns false if no changes
   StartWatching();
   EXPECT_FALSE(service_->SeenChangeSince(creation_time_));
   // Verify SeenChangeSince() returns true if network change
   MockDNSConfig("8.8.4.4");
   service_->OnNetworkChanged(NetworkChangeNotifier::CONNECTION_WIFI);
   EXPECT_TRUE(service_->SeenChangeSince(creation_time_));
   ExpectChange();
-  // Verify SeenChangeSince() returns true if hosts file changes
-  StartWatching();
-  EXPECT_FALSE(service_->SeenChangeSince(creation_time_));
-  WriteMockHostsFile(kTempHosts2);
-  EXPECT_TRUE(service_->SeenChangeSince(creation_time_));
-  ExpectChange();
 }
 
 }  // namespace internal
 
 #endif  // OS_ANDROID
 
 }  // namespace net