ChromeOS: chromeos should not depend on chromeos_test_support.

chromeos/geolocation/simple_geolocation_request_test_monitor.h

 // Copyright 2016 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.
 
 #ifndef CHROMEOS_GEOLOCATION_SIMPLE_GEOLOCATION_REQUEST_TEST_MONITOR_H_
 #define CHROMEOS_GEOLOCATION_SIMPLE_GEOLOCATION_REQUEST_TEST_MONITOR_H_
 
 #include "base/macros.h"
+#include "chromeos/chromeos_export.h"
 
 namespace chromeos {
 
 class SimpleGeolocationRequest;
 
 // This is global hook, that allows to monitor SimpleGeolocationRequest
 // in tests.
-
-class SimpleGeolocationRequestTestMonitor {
+//
+// Note: we need CHROMEOS_EXPORT for tests.
+class CHROMEOS_EXPORT SimpleGeolocationRequestTestMonitor {
  public:
   SimpleGeolocationRequestTestMonitor();
 
   virtual ~SimpleGeolocationRequestTestMonitor();
   virtual void OnRequestCreated(SimpleGeolocationRequest* request);
   virtual void OnStart(SimpleGeolocationRequest* request);
 
  private:
   DISALLOW_COPY_AND_ASSIGN(SimpleGeolocationRequestTestMonitor);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROMEOS_GEOLOCATION_SIMPLE_GEOLOCATION_REQUEST_TEST_MONITOR_H_