[iOS] Upstream //ios/chrome/browser/ui/commands changes

ios/chrome/browser/ui/commands/clear_browsing_data_command.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_UI_COMMANDS_CLEAR_BROWSING_DATA_COMMAND_H_
 #define IOS_CHROME_BROWSER_UI_COMMANDS_CLEAR_BROWSING_DATA_COMMAND_H_
 
 #import <Foundation/Foundation.h>
 
+#import "ios/chrome/browser/ui/commands/generic_chrome_command.h"
+
 namespace ios {
 class ChromeBrowserState;
 }
 
 // Command sent to clear the browsing data associated with a browser state.
-@interface ClearBrowsingDataCommand : NSObject
+@interface ClearBrowsingDataCommand : GenericChromeCommand
 
+// Mark inherited initializer as unavailable to prevent calling it by mistake.
+- (instancetype)initWithTag:(NSInteger)tag NS_UNAVAILABLE;
+
+// Initializes a command intented to clear browsing data for |browserState|
+// that correspong to removal mask |mask|.
 - (instancetype)initWithBrowserState:(ios::ChromeBrowserState*)browserState
-                                mask:(int)mask;
+                                mask:(int)mask NS_DESIGNATED_INITIALIZER;
 
-@property(nonatomic, readonly, assign) ios::ChromeBrowserState* browserState;
-@property(nonatomic, readonly, assign) int mask;
+// When executed this command will remove browsing data for this BrowserState.
+@property(nonatomic, readonly) ios::ChromeBrowserState* browserState;
+
+// Removal mask: see BrowsingDataRemover::RemoveDataMask.
+@property(nonatomic, readonly) int mask;
 
 @end
 
 #endif  // IOS_CHROME_BROWSER_UI_COMMANDS_CLEAR_BROWSING_DATA_COMMAND_H_