Componentize component_updater: Split crx_file code off into its own component.

components/crx_file/crx_file.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 "extensions/common/crx_file.h"
+#include "components/crx_file/crx_file.h"
 
-namespace extensions {
+namespace crx_file {
 
 namespace {
 
 // The current version of the crx format.
 static const uint32 kCurrentVersion = 2;
 
 // The current version of the crx diff format.
 static const uint32 kCurrentDiffVersion = 0;
 
 // The maximum size the crx parser will tolerate for a public key.
@@ skipping 53 matching lines @@
     *error = kInvalidKeyTooSmall;
   else if (header.signature_size > kMaxSignatureSize)
     *error = kInvalidSignatureTooLarge;
   else if (header.signature_size == 0)
     *error = kInvalidSignatureTooSmall;
   else
     valid = true;
   return valid;
 }
 
-}  // namespace extensions
+}  // namespace crx_file