Specify AllowCaching = false for dynamically-generated contents

chrome/browser/ui/webui/extensions/extension_icon_source.cc

 // 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.
 
 #include "chrome/browser/ui/webui/extensions/extension_icon_source.h"
 
 #include <stddef.h>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
@@ skipping 120 matching lines @@
   ExtensionResource icon = IconsInfo::GetIconResource(
       request->extension.get(), request->size, request->match);
 
   if (icon.relative_path().empty()) {
     LoadIconFailed(next_id);
   } else {
     LoadExtensionImage(icon, next_id);
   }
 }
 
+bool ExtensionIconSource::AllowCaching() const {
+  // Should not be cached to reflect the latest contents that may be updated by
+  // Extensions.
+  return false;
+}
+
 ExtensionIconSource::~ExtensionIconSource() {
 }
 
 const SkBitmap* ExtensionIconSource::GetDefaultAppImage() {
   if (!default_app_data_.get())
     default_app_data_.reset(LoadImageByResourceId(IDR_APP_DEFAULT_ICON));
 
   return default_app_data_.get();
 }
 
@@ skipping 178 matching lines @@
 ExtensionIconSource::ExtensionIconRequest* ExtensionIconSource::GetData(
     int request_id) {
   return request_map_[request_id].get();
 }
 
 void ExtensionIconSource::ClearData(int request_id) {
   request_map_.erase(request_id);
 }
 
 }  // namespace extensions