[cros login] Split login related classes into subfolders.

chrome/browser/chromeos/login/signin/merge_session_throttle.h

Index: chrome/browser/chromeos/login/signin/merge_session_throttle.h
diff --git a/chrome/browser/chromeos/login/merge_session_throttle.h b/chrome/browser/chromeos/login/signin/merge_session_throttle.h
similarity index 93%
rename from chrome/browser/chromeos/login/merge_session_throttle.h
rename to chrome/browser/chromeos/login/signin/merge_session_throttle.h
index 927fd86a6952b7e5a7bd1d0057c2ca78ddc540c0..09f0dc7acbbf8ea05982cb5a07c1306ee42c8487 100644
--- a/chrome/browser/chromeos/login/merge_session_throttle.h
+++ b/chrome/browser/chromeos/login/signin/merge_session_throttle.h
@@ -2,8 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef CHROME_BROWSER_CHROMEOS_LOGIN_MERGE_SESSION_THROTTLE_H_
-#define CHROME_BROWSER_CHROMEOS_LOGIN_MERGE_SESSION_THROTTLE_H_
+#ifndef CHROME_BROWSER_CHROMEOS_LOGIN_SIGNIN_MERGE_SESSION_THROTTLE_H_
+#define CHROME_BROWSER_CHROMEOS_LOGIN_SIGNIN_MERGE_SESSION_THROTTLE_H_
 
 #include <set>
 
@@ -93,4 +93,4 @@ class MergeSessionThrottle
   DISALLOW_COPY_AND_ASSIGN(MergeSessionThrottle);
 };
 
-#endif  // CHROME_BROWSER_CHROMEOS_LOGIN_MERGE_SESSION_THROTTLE_H_
+#endif  // CHROME_BROWSER_CHROMEOS_LOGIN_SIGNIN_MERGE_SESSION_THROTTLE_H_