cocoa browser: remove remaining non-MD code

chrome/browser/ui/cocoa/hover_close_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/hover_close_button.h"
 
 #include "base/mac/foundation_util.h"
 #include "base/strings/sys_string_conversions.h"
 #include "chrome/browser/themes/theme_properties.h"
 #include "chrome/browser/themes/theme_service.h"
@@ skipping 142 matching lines @@
 
 - (void)setFadeOutValue:(CGFloat)value {
   [self setNeedsDisplay];
 }
 
 - (TabView *)tabView {
   return base::mac::ObjCCast<TabView>([self superview]);
 }
 
 - (NSImage*)imageForHoverState:(HoverState)hoverState {
-  int imageID = IDR_CLOSE_1;
-
-  if (!ui::MaterialDesignController::IsModeMaterial()) {
-    switch (hoverState) {
-      case kHoverStateNone:
-        imageID = IDR_CLOSE_1;
-        break;
-      case kHoverStateMouseOver:
-        imageID = IDR_CLOSE_1_H;
-        break;
-      case kHoverStateMouseDown:
-        imageID = IDR_CLOSE_1_P;
-        break;
-    }
-    ui::ResourceBundle& bundle = ui::ResourceBundle::GetSharedInstance();
-    return bundle.GetNativeImageNamed(imageID).ToNSImage();
-  }
-
   gfx::VectorIconId vectorIconID;
   SkColor vectorIconColor = gfx::kPlaceholderColor;
   TabView* tabView = [self tabView];
 
   switch (hoverState) {
     case kHoverStateNone:
       vectorIconID = gfx::VectorIconId::TAB_CLOSE_NORMAL;
       vectorIconColor =
           tabView ? [tabView iconColor] : tabs::kDefaultTabTextColor;
       break;
@@ skipping 94 matching lines @@
       break;
     case kHoverStateMouseDown:
       imageID = IDR_CLOSE_DIALOG_P;
       break;
   }
   ui::ResourceBundle& bundle = ui::ResourceBundle::GetSharedInstance();
   return bundle.GetNativeImageNamed(imageID).ToNSImage();
 }
 
 @end