policy: Remove SigninManager from UserCloudPolicyStore.

chrome/browser/policy/cloud/user_cloud_policy_store.cc

Index: chrome/browser/policy/cloud/user_cloud_policy_store.cc
diff --git a/chrome/browser/policy/cloud/user_cloud_policy_store.cc b/chrome/browser/policy/cloud/user_cloud_policy_store.cc
index cda8fb7f1c57b500da256413d8725a38faebb1a0..43f4e868d61c7f8e15a9b4ba8a99a91bb5030d08 100644
--- a/chrome/browser/policy/cloud/user_cloud_policy_store.cc
+++ b/chrome/browser/policy/cloud/user_cloud_policy_store.cc
@@ -114,6 +114,10 @@ scoped_ptr<UserCloudPolicyStore> UserCloudPolicyStore::Create(
       new UserCloudPolicyStore(profile, path, background_task_runner));
 }
 
+void UserCloudPolicyStore::SetSigninUsername(const std::string& username) {
+  signin_username_ = username;
+}
+
 void UserCloudPolicyStore::LoadImmediately() {
   DVLOG(1) << "Initiating immediate policy load from disk";
   // Cancel any pending Load/Store/Validate operations.
@@ -217,17 +221,10 @@ void UserCloudPolicyStore::Validate(
   scoped_ptr<UserCloudPolicyValidator> validator = CreateValidator(
       policy.Pass(),
       CloudPolicyValidatorBase::TIMESTAMP_NOT_BEFORE);
-  SigninManager* signin = SigninManagerFactory::GetForProfileIfExists(profile_);
-  if (signin) {
-    std::string username = signin->GetAuthenticatedUsername();
-    if (username.empty())
-      username = signin->GetUsernameForAuthInProgress();
-
-    // Validate the username if the user is signed in (or in the process of
-    // signing in).
-    if (!username.empty())
-      validator->ValidateUsername(username);
-  }
+
+  // Validate the username if the user is signed in.
+  if (!signin_username_.empty())
+    validator->ValidateUsername(signin_username_);
 
   if (validate_in_background) {
     // Start validation in the background. The Validator will free itself once