Cleanup: remove redundant tab close observation from TabModalConfirmDialogDelegate

chrome/browser/plugins/plugin_observer.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/plugins/plugin_observer.h"
 
 #include "base/auto_reset.h"
 #include "base/bind.h"
 #include "base/debug/crash_logging.h"
 #include "base/metrics/histogram.h"
@@ skipping 65 matching lines @@
 
  private:
   content::WebContents* web_contents_;
   scoped_ptr<PluginMetadata> plugin_metadata_;
 };
 
 ConfirmInstallDialogDelegate::ConfirmInstallDialogDelegate(
     content::WebContents* web_contents,
     PluginInstaller* installer,
     scoped_ptr<PluginMetadata> plugin_metadata)
-    : TabModalConfirmDialogDelegate(web_contents),
-      WeakPluginInstallerObserver(installer),
+    : WeakPluginInstallerObserver(installer),
       web_contents_(web_contents),
       plugin_metadata_(plugin_metadata.Pass()) {
 }
 
 string16 ConfirmInstallDialogDelegate::GetTitle() {
   return l10n_util::GetStringFUTF16(
       IDS_PLUGIN_CONFIRM_INSTALL_DIALOG_TITLE, plugin_metadata_->name());
 }
 
 string16 ConfirmInstallDialogDelegate::GetMessage() {
@@ skipping 307 matching lines @@
   scoped_ptr<PluginMetadata> plugin;
   bool ret = PluginFinder::GetInstance()->FindPluginWithIdentifier(
           identifier, NULL, &plugin);
   DCHECK(ret);
 
   PluginMetroModeInfoBarDelegate::Create(
       InfoBarService::FromWebContents(web_contents()),
       PluginMetroModeInfoBarDelegate::DESKTOP_MODE_REQUIRED, plugin->name());
 #endif
 }