Ensure incognito TestingProfiles are incognito for their whole lifetime.

chrome/browser/chromeos/policy/user_cloud_policy_manager_chromeos_unittest.cc

Index: chrome/browser/chromeos/policy/user_cloud_policy_manager_chromeos_unittest.cc
diff --git a/chrome/browser/chromeos/policy/user_cloud_policy_manager_chromeos_unittest.cc b/chrome/browser/chromeos/policy/user_cloud_policy_manager_chromeos_unittest.cc
index 6ddccc6b1cf5d8249fc056885ba7468614dec873..4490749f4981e0b1baf60aa2ada96eb6e1040fd9 100644
--- a/chrome/browser/chromeos/policy/user_cloud_policy_manager_chromeos_unittest.cc
+++ b/chrome/browser/chromeos/policy/user_cloud_policy_manager_chromeos_unittest.cc
@@ -99,13 +99,10 @@ class UserCloudPolicyManagerChromeOSTest : public testing::Test {
         0,
         std::string(),
         factories);
-    signin_profile_ = profile_manager_->CreateTestingProfile(kSigninProfile);
-    signin_profile_->ForceIncognito(true);
     // Usually the signin Profile and the main Profile are separate, but since
     // the signin Profile is an OTR Profile then for this test it suffices to
     // attach it to the main Profile.
-    profile_->SetOffTheRecordProfile(scoped_ptr<Profile>(signin_profile_));
-    signin_profile_->SetOriginalProfile(profile_);
+    signin_profile_ = TestingProfile::Builder().BuildIncognito(profile_);
     ASSERT_EQ(signin_profile_, chromeos::ProfileHelper::GetSigninProfile());
 
     chrome::RegisterLocalState(prefs_.registry());
@@ -156,7 +153,6 @@ class UserCloudPolicyManagerChromeOSTest : public testing::Test {
     }
     signin_profile_ = NULL;
     profile_ = NULL;
-    profile_manager_->DeleteTestingProfile(kSigninProfile);
     profile_manager_->DeleteTestingProfile(chrome::kInitialProfile);
   }