[Proximity Auth] Create one ProximityAuthClient per profile, rather than one global one.

chrome/browser/extensions/api/screenlock_private/screenlock_private_apitest.cc

 // Copyright 2013 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 "base/strings/string16.h"
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/extensions/api/screenlock_private/screenlock_private_api.h"
 #include "chrome/browser/extensions/extension_apitest.h"
 #include "chrome/browser/profiles/profile_info_cache.h"
@@ skipping 77 matching lines @@
   void RunTest(const std::string& extension_name) {
     ASSERT_TRUE(RunComponentExtensionTest(extension_name)) << message_;
   }
 
  private:
   content::NotificationRegistrar registrar_;
 
   DISALLOW_COPY_AND_ASSIGN(ScreenlockPrivateApiTest);
 };
 
+// Locking is currently implemented only on ChromeOS.
+#if defined(OS_CHROMEOS)
+
 // Time out under MSan. http://crbug.com/478091
 // Flaky under LSan on ChromeOS. http://crbug.com/482002
 #if defined(MEMORY_SANITIZER) || defined(LEAK_SANITIZER) && defined(OS_CHROMEOS)
 #define MAYBE_LockUnlock DISABLED_LockUnlock
 #define MAYBE_AuthType DISABLED_AuthType
 #else
 #define MAYBE_LockUnlock LockUnlock
 #define MAYBE_AuthType AuthType
 #endif
 
 IN_PROC_BROWSER_TEST_F(ScreenlockPrivateApiTest, MAYBE_LockUnlock) {
   RunTest("screenlock_private/lock_unlock");
 }
 
 IN_PROC_BROWSER_TEST_F(ScreenlockPrivateApiTest, MAYBE_AuthType) {
   RunTest("screenlock_private/auth_type");
 }
 
+#endif  // defined(OS_CHROMEOS)
+
 }  // namespace extensions