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

components/crx_file/crx_file.h

Index: components/crx_file/crx_file.h
diff --git a/extensions/common/crx_file.h b/components/crx_file/crx_file.h
similarity index 94%
rename from extensions/common/crx_file.h
rename to components/crx_file/crx_file.h
index d7c33ab2c2fcae6ac2710f92a365d902901c1738..aba4d73f7a531a6847e0bd728ff37e8ab1616d3b 100644
--- a/extensions/common/crx_file.h
+++ b/components/crx_file/crx_file.h
@@ -2,14 +2,14 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef EXTENSIONS_COMMON_CRX_FILE_H_
-#define EXTENSIONS_COMMON_CRX_FILE_H_
+#ifndef COMPONENTS_CRX_FILE_CRX_FILE_H_
+#define COMPONENTS_CRX_FILE_CRX_FILE_H_
 
 #include <sys/types.h>
 #include "base/basictypes.h"
 #include "base/memory/scoped_ptr.h"
 
-namespace extensions {
+namespace crx_file {
 
 // CRX files have a header that includes a magic key, version number, and
 // some signature sizing information. Use CrxFile object to validate whether
@@ -74,6 +74,6 @@ class CrxFile {
   static bool HeaderIsValid(const Header& header, Error* error);
 };
 
-}  // namespace extensions
+}  // namespace crx_file
 
-#endif  // EXTENSIONS_COMMON_CRX_FILE_H_
+#endif  // COMPONENTS_CRX_FILE_CRX_FILE_H_