Enable CSP by default for extensions with manifest_version >= 2.

chrome/common/extensions/extension_constants.h

 // Copyright (c) 2011 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 CHROME_COMMON_EXTENSIONS_EXTENSION_CONSTANTS_H_
 #define CHROME_COMMON_EXTENSIONS_EXTENSION_CONSTANTS_H_
 #pragma once
 
 #include <string>
 
@@ skipping 37 matching lines @@
   extern const char* kJs;
   extern const char* kKeycode;
   extern const char* kLanguage;
   extern const char* kLaunch;
   extern const char* kLaunchContainer;
   extern const char* kLaunchHeight;
   extern const char* kLaunchLocalPath;
   extern const char* kLaunchWebURL;
   extern const char* kLaunchWidth;
   extern const char* kLayouts;
+  extern const char* kManifestVersion;
   extern const char* kMatches;
   extern const char* kMinimumChromeVersion;
   extern const char* kNaClModules;
   extern const char* kNaClModulesMIMEType;
   extern const char* kNaClModulesPath;
   extern const char* kName;
   extern const char* kOfflineEnabled;
   extern const char* kOmnibox;
   extern const char* kOmniboxKeyword;
   extern const char* kOptionalPermissions;
@@ skipping 128 matching lines @@
   extern const char* kInvalidKey;
   extern const char* kInvalidLaunchContainer;
   extern const char* kInvalidLaunchContainerForPlatform;
   extern const char* kInvalidLaunchHeight;
   extern const char* kInvalidLaunchHeightContainer;
   extern const char* kInvalidLaunchLocalPath;
   extern const char* kInvalidLaunchWebURL;
   extern const char* kInvalidLaunchWidth;
   extern const char* kInvalidLaunchWidthContainer;
   extern const char* kInvalidManifest;
+  extern const char* kInvalidManifestVersion;
   extern const char* kInvalidMatch;
   extern const char* kInvalidMatchCount;
   extern const char* kInvalidMatches;
   extern const char* kInvalidMinimumChromeVersion;
   extern const char* kInvalidNaClModules;
   extern const char* kInvalidNaClModulesMIMEType;
   extern const char* kInvalidNaClModulesPath;
   extern const char* kInvalidName;
   extern const char* kInvalidOfflineEnabled;
   extern const char* kInvalidOmniboxKeyword;
@@ skipping 253 matching lines @@
     SYNC_PROMO_CONFIRMED_AFTER_SIGN_IN,
     SYNC_PROMO_CLOSED_TAB,
     SYNC_PROMO_CLOSED_WINDOW,
     SYNC_PROMO_BUCKET_BOUNDARY,
     SYNC_PROMO_FIRST_VALID_JS_ACTION = SYNC_PROMO_LEARN_MORE_CLICKED,
     SYNC_PROMO_LAST_VALID_JS_ACTION = SYNC_PROMO_CONFIRMED_AFTER_SIGN_IN,
   };
 } // extension_misc
 
 #endif  // CHROME_COMMON_EXTENSIONS_EXTENSION_CONSTANTS_H_