cocoa browser: remove remaining non-MD code

chrome/browser/ui/cocoa/extensions/browser_action_button.mm

 // Copyright (c) 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.
 
 #import "chrome/browser/ui/cocoa/extensions/browser_action_button.h"
 
 #include <algorithm>
 #include <cmath>
 
 #include "base/logging.h"
@@ skipping 195 matching lines @@
     browserActionsController_ = controller;
     viewController_ = viewController;
     viewControllerDelegate_.reset(
         new ToolbarActionViewDelegateBridge(self, controller, viewController));
 
     [cell setBrowserActionsController:controller];
     [cell
         accessibilitySetOverrideValue:base::SysUTF16ToNSString(
             viewController_->GetAccessibleName([controller currentWebContents]))
         forAttribute:NSAccessibilityDescriptionAttribute];
-    if (!ui::MaterialDesignController::IsModeMaterial()) {
-      [cell setImageID:IDR_BROWSER_ACTION
-        forButtonState:image_button_cell::kDefaultState];
-      [cell setImageID:IDR_BROWSER_ACTION_H
-        forButtonState:image_button_cell::kHoverState];
-      [cell setImageID:IDR_BROWSER_ACTION_P
-        forButtonState:image_button_cell::kPressedState];
-      [cell setImageID:IDR_BROWSER_ACTION
-        forButtonState:image_button_cell::kDisabledState];
-    }
     [self setTitle:@""];
     [self setButtonType:NSMomentaryChangeButton];
     [self setShowsBorderOnlyWhileMouseInside:YES];
 
     moveAnimation_.reset([[NSViewAnimation alloc] init]);
     [moveAnimation_ gtm_setDuration:kAnimationDuration
                           eventMask:NSLeftMouseUpMask];
     [moveAnimation_ setAnimationBlockingMode:NSAnimationNonblocking];
 
     [self updateState];
@@ skipping 343 matching lines @@
 - (const ui::ThemeProvider*)themeProviderForWindow:(NSWindow*)window {
   const ui::ThemeProvider* themeProvider = [window themeProvider];
   if (!themeProvider)
     themeProvider =
         [[browserActionsController_ browser]->window()->GetNativeWindow()
             themeProvider];
   return themeProvider;
 }
 
 @end