Add a confirmation prompt to app uninstallation on the ntp.

chrome/browser/cocoa/extension_install_prompt.mm

 // Copyright (c) 2010 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.
 
 #import <Cocoa/Cocoa.h>
 
 #include <string>
 
 #include "app/l10n_util_mac.h"
 #include "app/resource_bundle.h"
 #include "base/sys_string_conversions.h"
 #include "base/utf_string_conversions.h"
 #include "chrome/browser/extensions/extension_install_ui.h"
 #include "chrome/common/extensions/extension.h"
 #include "grit/browser_resources.h"
 #include "grit/chromium_strings.h"
 #include "grit/generated_resources.h"
 #include "skia/ext/skia_utils_mac.h"
 
 class Profile;
 
 void ExtensionInstallUI::ShowExtensionInstallUIPromptImpl(
     Profile* profile, Delegate* delegate, Extension* extension, SkBitmap* icon,
-    const string16& warning_text, ExtensionInstallUI::PromptType type) {
+    ExtensionInstallUI::PromptType type) {
   NSAlert* alert = [[[NSAlert alloc] init] autorelease];
 
   NSButton* continueButton = [alert addButtonWithTitle:l10n_util::GetNSString(
       ExtensionInstallUI::kButtonIds[type])];
   // Clear the key equivalent (currently 'Return') because cancel is the default
   // button.
   [continueButton setKeyEquivalent:@""];
 
   NSButton* cancelButton = [alert addButtonWithTitle:l10n_util::GetNSString(
       IDS_CANCEL)];
   [cancelButton setKeyEquivalent:@"\r"];
 
   [alert setMessageText:l10n_util::GetNSStringF(
        ExtensionInstallUI::kHeadingIds[type],
        UTF8ToUTF16(extension->name()))];
-  [alert setInformativeText:base::SysUTF16ToNSString(warning_text)];
   [alert setAlertStyle:NSWarningAlertStyle];
   [alert setIcon:gfx::SkBitmapToNSImage(*icon)];
 
   if ([alert runModal] == NSAlertFirstButtonReturn) {
     delegate->InstallUIProceed(false);
   } else {
     delegate->InstallUIAbort();
   }
 }