Remove toggle button code from Tab Strip.

ios/chrome/browser/ui/tabs/tab_strip_controller.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_TABS_TAB_STRIP_CONTROLLER_H_
 #define IOS_CHROME_BROWSER_UI_TABS_TAB_STRIP_CONTROLLER_H_
 
 #import <UIKit/UIKit.h>
 
 @class TabModel;
@@ skipping 16 matching lines @@
 extern NSString* const kTabStripDragEnded;
 
 // Controller class for the tabstrip.  Manages displaying tabs and keeping the
 // display in sync with the TabModel.  This controller is only instantiated on
 // tablet.  The tab strip view itself is a subclass of UIScrollView, which
 // manages scroll offsets and scroll animations.
 @interface TabStripController : NSObject
 
 @property(nonatomic, assign) BOOL highlightsSelectedTab;
 @property(nonatomic, readonly, retain) UIView* view;
-// YES if the tab strip will display the mode toggle switch. May be set to the
-// same value repeatedly with no layout penalty.
-@property(nonatomic, assign) BOOL hasModeToggleSwitch;
 
-// YES if the tab strip will display the tab switcher toggle switch. May be set
-// to the same value repeatedly with no layout penalty.
-@property(nonatomic, assign) BOOL hasTabSwitcherToggleSwitch;
-
-// May be nil if there is no mode toggle button.
-@property(nonatomic, readonly, assign) UIButton* modeToggleButton;
 // Used to check if the tabstrip is visible before starting an animation.
 @property(nonatomic, assign) id<FullScreenControllerDelegate>
     fullscreenDelegate;
 
 // Designated initializer.
 - (instancetype)initWithTabModel:(TabModel*)tabModel
                            style:(TabStrip::Style)style
     NS_DESIGNATED_INITIALIZER;
 
 - (instancetype)init NS_UNAVAILABLE;
 
 // Called when a tab is tapped.  |sender| should be a TabView.
 - (IBAction)tabTapped:(id)sender;
 
 // Records metrics for the given action.
 - (IBAction)recordUserMetrics:(id)sender;
 
 @end
 
 #endif  // IOS_CHROME_BROWSER_UI_TABS_TAB_STRIP_CONTROLLER_H_