Improve the UI for disabling off-store extension install.

chrome/browser/extensions/crx_installer.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/extensions/crx_installer.h"
 
 #include <map>
 #include <set>
 
 #include "base/bind.h"
@@ skipping 18 matching lines @@
 #include "chrome/browser/extensions/permissions_updater.h"
 #include "chrome/browser/extensions/webstore_installer.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/shell_integration.h"
 #include "chrome/browser/web_applications/web_app.h"
 #include "chrome/common/chrome_notification_types.h"
 #include "chrome/common/chrome_paths.h"
 #include "chrome/common/extensions/extension_constants.h"
 #include "chrome/common/extensions/extension_file_util.h"
 #include "chrome/common/extensions/extension_icon_set.h"
+#include "chrome/common/extensions/extension_switch_utils.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/notification_service.h"
 #include "content/public/browser/resource_dispatcher_host.h"
 #include "content/public/browser/user_metrics.h"
 #include "grit/chromium_strings.h"
 #include "grit/generated_resources.h"
 #include "grit/theme_resources.h"
 #include "third_party/skia/include/core/SkBitmap.h"
 #include "ui/base/l10n/l10n_util.h"
 #include "ui/base/resource/resource_bundle.h"
@@ skipping 133 matching lines @@
   // TODO(aa): conversion data gets lost here :(
 
   OnUnpackSuccess(extension->path(), extension->path(), NULL, extension);
 }
 
 bool CrxInstaller::AllowInstall(const Extension* extension,
                                 string16* error) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::FILE));
   DCHECK(error);
 
+  if (!extension->is_theme() &&
+      !extensions::switch_utils::IsOffStoreInstallEnabled() &&
+      !is_gallery_install()) {
+    *error = l10n_util::GetStringUTF16(
+        IDS_EXTENSION_INSTALL_DISALLOWED_ON_SITE);
+    return false;
+  }
+
   // Make sure the expected ID matches if one was supplied or if we want to
   // bypass the prompt.
   if ((approved_ || !expected_id_.empty()) &&
       expected_id_ != extension->id()) {
     *error = l10n_util::GetStringFUTF16(IDS_EXTENSION_INSTALL_UNEXPECTED_ID,
                                         ASCIIToUTF16(expected_id_),
                                         ASCIIToUTF16(extension->id()));
     return false;
   }
 
@@ skipping 349 matching lines @@
   // Some users (such as the download shelf) need to know when a
   // CRXInstaller is done.  Listening for the EXTENSION_* events
   // is problematic because they don't know anything about the
   // extension before it is unpacked, so they cannot filter based
   // on the extension.
   content::NotificationService::current()->Notify(
       chrome::NOTIFICATION_CRX_INSTALLER_DONE,
       content::Source<CrxInstaller>(this),
       content::Details<const Extension>(extension));
 }