mac: Delete GetCachedImageWithName(), it's no longer used.

content/browser/web_contents/web_drag_source_mac.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 "content/browser/web_contents/web_drag_source_mac.h"
 
 #include <sys/param.h>
 
 #include "base/bind.h"
 #include "base/file_path.h"
@@ skipping 13 matching lines @@
 #include "content/public/common/content_client.h"
 #include "content/public/common/url_constants.h"
 #include "grit/ui_resources.h"
 #include "net/base/escape.h"
 #include "net/base/file_stream.h"
 #include "net/base/mime_util.h"
 #include "net/base/net_util.h"
 #include "ui/base/clipboard/custom_data_helper.h"
 #include "ui/base/dragdrop/cocoa_dnd_util.h"
 #include "ui/gfx/image/image.h"
-#include "ui/gfx/mac/nsimage_cache.h"
 #include "webkit/glue/webdropdata.h"
 
 using base::SysNSStringToUTF8;
 using base::SysUTF8ToNSString;
 using base::SysUTF16ToNSString;
 using content::BrowserThread;
 using content::DragDownloadFile;
 using content::PromiseFileFinalizer;
 using content::RenderViewHostImpl;
 using net::FileStream;
@@ skipping 417 matching lines @@
 - (NSImage*)dragImage {
   if (dragImage_)
     return dragImage_;
 
   // Default to returning a generic image.
   return content::GetContentClient()->GetNativeImageNamed(
       IDR_DEFAULT_FAVICON).ToNSImage();
 }
 
 @end  // @implementation WebDragSource (Private)