[Mac] Adjust toolbar spacing of browser actions for M6.

chrome/browser/cocoa/extensions/browser_actions_controller.h

 // Copyright (c) 2010 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_COCOA_EXTENSIONS_BROWSER_ACTIONS_CONTROLLER_H_
 #define CHROME_BROWSER_COCOA_EXTENSIONS_BROWSER_ACTIONS_CONTROLLER_H_
 #pragma once
 
 #import <Cocoa/Cocoa.h>
 
 #import "base/scoped_nsobject.h"
 #include "base/scoped_ptr.h"
 
 class Browser;
 @class BrowserActionButton;
 @class BrowserActionsContainerView;
 class Extension;
 @class ExtensionPopupController;
 class ExtensionToolbarModel;
 class ExtensionsServiceObserverBridge;
 @class MenuButton;
 class PrefService;
 class Profile;
 
-// The padding between browser action buttons.
-extern const CGFloat kBrowserActionButtonPadding;
-
 // Sent when the visibility of the Browser Actions changes.
 extern NSString* const kBrowserActionVisibilityChangedNotification;
 
 // Handles state and provides an interface for controlling the Browser Actions
 // container within the Toolbar.
 @interface BrowserActionsController : NSObject {
  @private
   // Reference to the current browser. Weak.
   Browser* browser_;
 
@@ skipping 73 matching lines @@
 // Registers the user preferences used by this class.
 + (void)registerUserPrefs:(PrefService*)prefs;
 
 @end  // @interface BrowserActionsController
 
 @interface BrowserActionsController(TestingAPI)
 - (NSButton*)buttonWithIndex:(NSUInteger)index;
 @end
 
 #endif  // CHROME_BROWSER_COCOA_EXTENSIONS_BROWSER_ACTIONS_CONTROLLER_H_