Move ".crx"/".pem" constants and extension_filenames constants into extensions/common/constants.cc.

chrome/common/extensions/extension.h

 // Copyright (c) 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 CHROME_COMMON_EXTENSIONS_EXTENSION_H_
 #define CHROME_COMMON_EXTENSIONS_EXTENSION_H_
 
 #include <algorithm>
 #include <iosfwd>
 #include <map>
@@ skipping 160 matching lines @@
 #if defined(OS_WIN)
   static const char kExtensionRegistryPath[];
 #endif
 
   // The mimetype used for extensions.
   static const char kMimeType[];
 
   // Checks to see if the extension has a valid ID.
   static bool IdIsValid(const std::string& id);
 
-  // Returns true if the specified file is an extension.
-  static bool IsExtension(const base::FilePath& file_name);
-
   // See Type definition in Manifest.
   Manifest::Type GetType() const;
 
   // Returns an absolute url to a resource inside of an extension. The
   // |extension_url| argument should be the url() from an Extension object. The
   // |relative_path| can be untrusted user input. The returned URL will either
   // be invalid() or a child of |extension_url|.
   // NOTE: Static so that it can be used from multiple threads.
   static GURL GetResourceURL(const GURL& extension_url,
                              const std::string& relative_path);
@@ skipping 322 matching lines @@
 
   UpdatedExtensionPermissionsInfo(
       const Extension* extension,
       const PermissionSet* permissions,
       Reason reason);
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_COMMON_EXTENSIONS_EXTENSION_H_