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

components/crx_file/crx_file.cc

Index: components/crx_file/crx_file.cc
diff --git a/extensions/common/crx_file.cc b/components/crx_file/crx_file.cc
similarity index 96%
rename from extensions/common/crx_file.cc
rename to components/crx_file/crx_file.cc
index 73e7f7b73d6b778f6f59286882726aa005ebf38b..dc6ef991b203e1346c49408cfe6cfab547469e80 100644
--- a/extensions/common/crx_file.cc
+++ b/components/crx_file/crx_file.cc
@@ -2,9 +2,9 @@
 // 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 {
 
@@ -78,4 +78,4 @@ bool CrxFile::HeaderIsValid(const CrxFile::Header& header,
   return valid;
 }
 
-}  // namespace extensions
+}  // namespace crx_file