[Extensions] Don't allow content scripts on the New Tab Page

extensions/common/manifest_constants.h

 // Copyright 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 EXTENSIONS_COMMON_MANIFEST_CONSTANTS_H_
 #define EXTENSIONS_COMMON_MANIFEST_CONSTANTS_H_
 
 #include "build/build_config.h"
 
 namespace extensions {
@@ skipping 247 matching lines @@
 extern const char kBackgroundRequiredForPlatformApps[];
 extern const char kCannotAccessAboutUrl[];
 extern const char kCannotAccessChromeUrl[];
 extern const char kCannotAccessExtensionUrl[];
 extern const char kCannotAccessPage[];
 extern const char kCannotAccessPageWithUrl[];
 extern const char kCannotChangeExtensionID[];
 extern const char kCannotClaimAllHostsInExtent[];
 extern const char kCannotClaimAllURLsInExtent[];
 extern const char kCannotScriptGallery[];
+extern const char kCannotScriptNtp[];
 extern const char kCannotScriptSigninPage[];
 extern const char kCannotUninstallManagedExtension[];
 extern const char kChromeVersionTooLow[];
 extern const char kDevToolsExperimental[];
 extern const char kDisabledByPolicy[];
 extern const char kExpectString[];
 extern const char kFileNotFound[];
 extern const char kInvalidAboutPage[];
 extern const char kInvalidAboutPageExpectRelativePath[];
 extern const char kInvalidAllFrames[];
@@ skipping 220 matching lines @@
 extern const char kInvalidActionHandlersType[];
 extern const char kInvalidFileSystemProviderMissingCapabilities[];
 extern const char kInvalidFileSystemProviderMissingPermission[];
 #endif
 
 }  // namespace manifest_errors
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_COMMON_MANIFEST_CONSTANTS_H_