Fix a bug where an extension's icon was not being properly updated.

chrome/common/extensions/extension.h

 // Copyright (c) 2013 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_COMMON_EXTENSIONS_EXTENSION_H_
 #define CHROME_COMMON_EXTENSIONS_EXTENSION_H_
 
 #include <algorithm>
 #include <iosfwd>
 #include <map>
@@ skipping 292 matching lines @@
   // else.
   void set_wants_file_access(bool wants_file_access) {
     wants_file_access_ = wants_file_access;
   }
   int creation_flags() const { return creation_flags_; }
   bool from_webstore() const { return (creation_flags_ & FROM_WEBSTORE) != 0; }
   bool from_bookmark() const { return (creation_flags_ & FROM_BOOKMARK) != 0; }
   bool was_installed_by_default() const {
     return (creation_flags_ & WAS_INSTALLED_BY_DEFAULT) != 0;
   }
+  int image_id() const { return image_id_; }
 
   // App-related.
   bool is_app() const;
   bool is_platform_app() const;
   bool is_hosted_app() const;
   bool is_legacy_packaged_app() const;
   bool is_extension() const;
   bool can_be_incognito_enabled() const;
 
   void AddWebExtentPattern(const URLPattern& pattern);
@@ skipping 113 matching lines @@
   bool display_in_new_tab_page_;
 
   // Whether the extension has host permissions or user script patterns that
   // imply access to file:/// scheme URLs (the user may not have actually
   // granted it that access).
   bool wants_file_access_;
 
   // The flags that were passed to InitFromValue.
   int creation_flags_;
 
+  // The randomly generated ID used to identify if an image needs to be
+  // cached again when reloaded.
+  int image_id_;
+
   DISALLOW_COPY_AND_ASSIGN(Extension);
 };
 
 typedef std::vector<scoped_refptr<const Extension> > ExtensionList;
 typedef std::set<std::string> ExtensionIdSet;
 typedef std::vector<std::string> ExtensionIdList;
 
 // Handy struct to pass core extension info around.
 struct ExtensionInfo {
   ExtensionInfo(const base::DictionaryValue* manifest,
@@ skipping 60 matching lines @@
 
   UpdatedExtensionPermissionsInfo(
       const Extension* extension,
       const PermissionSet* permissions,
       Reason reason);
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_COMMON_EXTENSIONS_EXTENSION_H_