Refactor code to clear last signed-in user.

chrome/browser/android/signin/signin_manager_android.h

 // 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.
 
 #ifndef CHROME_BROWSER_ANDROID_SIGNIN_SIGNIN_MANAGER_ANDROID_H_
 #define CHROME_BROWSER_ANDROID_SIGNIN_SIGNIN_MANAGER_ANDROID_H_
 
 #include <jni.h>
 
 #include <string>
@@ skipping 34 matching lines @@
 
   void SignOut(JNIEnv* env, jobject obj);
 
   base::android::ScopedJavaLocalRef<jstring> GetManagementDomain(JNIEnv* env,
                                                                  jobject obj);
 
   void WipeProfileData(JNIEnv* env, jobject obj);
 
   void LogInSignedInUser(JNIEnv* env, jobject obj);
 
+  void ClearLastSignedInUser(JNIEnv* env, jobject obj);
+
  private:
   virtual ~SigninManagerAndroid();
 
 #if defined(ENABLE_CONFIGURATION_POLICY)
   void OnPolicyRegisterDone(const std::string& dm_token,
                             const std::string& client_id);
   void OnPolicyFetchDone(bool success);
 #endif
 
   void OnBrowsingDataRemoverDone();
 
+  void ClearLastSignedInUser();
+
   // MergeSessionHelper::Observer implementation.
   virtual void MergeSessionCompleted(
       const std::string& account_id,
       const GoogleServiceAuthError& error) OVERRIDE;
 
   Profile* profile_;
 
   // Java-side SigninManager object.
   base::android::ScopedJavaGlobalRef<jobject> java_signin_manager_;
 
@@ skipping 10 matching lines @@
 
   // Helper to merge the signed into account into the cookie jar session.
   scoped_ptr<MergeSessionHelper> merge_session_helper_;
 
   base::WeakPtrFactory<SigninManagerAndroid> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(SigninManagerAndroid);
 };
 
 #endif  // CHROME_BROWSER_ANDROID_SIGNIN_SIGNIN_MANAGER_ANDROID_H_