Update of the extension install UI:

chrome/browser/extensions/extensions_service.cc

 // Copyright (c) 2009 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/extensions/extensions_service.h"
 
 #include "base/command_line.h"
 #include "base/file_util.h"
 #include "base/string_util.h"
 #include "base/values.h"
@@ skipping 361 matching lines @@
   // Ensure extension is deleted unless we transfer ownership.
   scoped_ptr<Extension> scoped_extension(extension);
 
   if (extensions_enabled() ||
       extension->IsTheme() ||
       extension->location() == Extension::LOAD ||
       Extension::IsExternalLocation(extension->location())) {
     Extension* old = GetExtensionByIdInternal(extension->id(), true, true);
     if (old) {
       if (extension->version()->CompareTo(*(old->version())) > 0) {
-        bool higher_permissions =
-            (extension->GetPermissionClass() > old->GetPermissionClass());
+        bool allow_silent_upgrade = Extension::AllowSilentUpgrade(old, extension);

[Matt Perry, 2009/08/26 21:10:32]

80 cols

 
         // To upgrade an extension in place, unload the old one and
         // then load the new one.
         UnloadExtension(old->id());
         old = NULL;
 
-        if (higher_permissions) {
-          // Extension was upgraded to a high permission class. Disable it and
+        if (!allow_silent_upgrade) {
+          // Extension has changed permissions significantly. Disable it and
           // notify the user.
           extension_prefs_->SetExtensionState(extension, Extension::DISABLED);
           NotificationService::current()->Notify(
               NotificationType::EXTENSION_UPDATE_DISABLED,
               Source<ExtensionsService>(this),
               Details<Extension>(extension));
         }
       } else {
         // We already have the extension of the same or older version.
         LOG(WARNING) << "Duplicate extension load attempt: " << extension->id();
@@ skipping 269 matching lines @@
       linked_ptr<ExternalExtensionProvider>(test_provider);
 }
 
 void ExtensionsServiceBackend::OnExternalExtensionFound(
     const std::string& id, const Version* version, const FilePath& path,
     Extension::Location location) {
   frontend_loop_->PostTask(FROM_HERE, NewRunnableMethod(frontend_,
       &ExtensionsService::OnExternalExtensionFound, id, version->GetString(),
       path, location));
 }