Move UpdateManifest to //extensions

extensions/common/update_manifest.h

 // Copyright (c) 2010 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_UPDATE_MANIFEST_H_
-#define CHROME_COMMON_EXTENSIONS_UPDATE_MANIFEST_H_
+#ifndef EXTENSIONS_COMMON_UPDATE_MANIFEST_H_
+#define EXTENSIONS_COMMON_UPDATE_MANIFEST_H_
 
 #include <string>
 #include <vector>
 
 #include "url/gurl.h"
 
 class UpdateManifest {
  public:
 
   // An update manifest looks like this:
@@ skipping 68 matching lines @@
  private:
   Results results_;
   std::string errors_;
 
   // Helper function that adds parse error details to our errors_ string.
   void ParseError(const char* details, ...);
 
   DISALLOW_COPY_AND_ASSIGN(UpdateManifest);
 };
 
-#endif  // CHROME_COMMON_EXTENSIONS_UPDATE_MANIFEST_H_
+#endif  // EXTENSIONS_COMMON_UPDATE_MANIFEST_H_