policy: Remove SigninManager from UserCloudPolicyStore.

chrome/browser/policy/cloud/user_cloud_policy_store.h

Index: chrome/browser/policy/cloud/user_cloud_policy_store.h
diff --git a/chrome/browser/policy/cloud/user_cloud_policy_store.h b/chrome/browser/policy/cloud/user_cloud_policy_store.h
index b1fcdbe5f9cc31e189ff9b2cbfbbcf67dce15610..c0265197376c0831de4d1a595fc25fe95e4d049c 100644
--- a/chrome/browser/policy/cloud/user_cloud_policy_store.h
+++ b/chrome/browser/policy/cloud/user_cloud_policy_store.h
@@ -39,6 +39,9 @@ class UserCloudPolicyStore : public UserCloudPolicyStoreBase {
       Profile* profile,
       scoped_refptr<base::SequencedTaskRunner> background_task_runner);
 
+  // Sets the username from signin for validation of the policy.
+  void SetSigninUsername(const std::string& username);
+
   // Loads policy immediately on the current thread. Virtual for mocks.
   virtual void LoadImmediately();
 
@@ -51,6 +54,9 @@ class UserCloudPolicyStore : public UserCloudPolicyStoreBase {
   virtual void Store(
       const enterprise_management::PolicyFetchResponse& policy) OVERRIDE;
 
+ protected:
+  std::string signin_username_;
+
  private:
   // Callback invoked when a new policy has been loaded from disk. If
   // |validate_in_background| is true, then policy is validated via a background