[ios] Cleanup SessionServiceIOS implementation.

ios/chrome/browser/sessions/session_service_ios.h

 // Copyright 2012 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 IOS_CHROME_BROWSER_SESSIONS_SESSION_SERVICE_H_
-#define IOS_CHROME_BROWSER_SESSIONS_SESSION_SERVICE_H_
+#ifndef IOS_CHROME_BROWSER_SESSIONS_SESSION_SERVICE_IOS_H_
+#define IOS_CHROME_BROWSER_SESSIONS_SESSION_SERVICE_IOS_H_
 
 #import <Foundation/Foundation.h>
 
-#include "base/mac/scoped_nsobject.h"
-
 namespace ios {
 class ChromeBrowserState;
 }
 
 @class SessionWindowIOS;
 
-// Trivial NSKeyedUnarchiver subclass that can be configured with a
-// ChromeBrowserState instance that decoding classes can use.
-@interface SessionWindowUnarchiver : NSKeyedUnarchiver
-
-// The BrowserState set on the unarchiver at init; a weak pointer.
-@property(nonatomic, readonly) ios::ChromeBrowserState* browserState;
-
-// Inits exactly as initForReadingWithData: does, additionally setting
-// |browserState| on the receiver.
-- (instancetype)initForReadingWithData:(NSData*)data
-                          browserState:(ios::ChromeBrowserState*)browserState
-    NS_DESIGNATED_INITIALIZER;
-
-@end
-
 // A singleton service for saving the current session. Can either save on a
 // delay or immediately. Saving is always performed on a separate thread.
 @interface SessionServiceIOS : NSObject
 
 // Lazily creates a singleton instance. Use this instead of calling alloc/init.
 + (SessionServiceIOS*)sharedService;
 
 // Saves the session represented by |window| to the given browserState directory
 // on disk. If |immediately| is NO, the save is done after a delay. If another
 // call is pending, this one is ignored. If YES, the save is done now,
 // cancelling any pending calls.  Either way, the save is done on a separate
 // thread to avoid blocking the UI thread. As a result, |window| should contain
 // copies of non-threadsafe objects.
 - (void)saveWindow:(SessionWindowIOS*)window
     forBrowserState:(ios::ChromeBrowserState*)browserState
         immediately:(BOOL)immediately;
 
 // Loads the window from the given browserState directory on disk on the main
 // thread. Returns nil if no session was previously saved.
 - (SessionWindowIOS*)loadWindowForBrowserState:
     (ios::ChromeBrowserState*)browserState;
 
 // Schedules deletion of the file containing the commands for the last session
 // in the given browserState directory.
 - (void)deleteLastSession:(NSString*)directory;
 
 // Loads the window from the given backup file on disk on the main thread.
 // Returns nil if unable to read the sessions.
-- (SessionWindowIOS*)loadWindowFromPath:(NSString*)path
-                        forBrowserState:(ios::ChromeBrowserState*)browserState;
+- (SessionWindowIOS*)loadWindowFromPath:(NSString*)sessionPath;
 
 // Returns the path of the session file.
 - (NSString*)sessionFilePathForDirectory:(NSString*)directory;
 
 @end
 
 @interface SessionServiceIOS (Testing)
 
 // For some of the unit tests, we need to make sure the session is saved
 // immediately so we can read it back in to verify various attributes. This
 // is not a situation we normally expect to be in because we never
 // want the session being saved on the main thread in the production app.
 - (void)performSaveWindow:(SessionWindowIOS*)window
               toDirectory:(NSString*)directory;
 
 @end
 
-#endif  // IOS_CHROME_BROWSER_SESSIONS_SESSION_SERVICE_H_
+#endif  // IOS_CHROME_BROWSER_SESSIONS_SESSION_SERVICE_IOS_H_