Rename extension_manifest_keys namespace to extensions::manifest_keys.

chrome/common/extensions/manifest_handlers/requirements_handler.cc

 // 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.
 
 #include "chrome/common/extensions/manifest_handlers/requirements_handler.h"
 
 #include "base/lazy_instance.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/values.h"
 #include "chrome/common/extensions/extension_manifest_constants.h"
 #include "extensions/common/error_utils.h"
 
-namespace keys = extension_manifest_keys;
+namespace keys = extensions::manifest_keys;
 namespace errors = extension_manifest_errors;
 
 namespace extensions {
 
 RequirementsInfo::RequirementsInfo(const Manifest* manifest)
     : webgl(false),
       css3d(false),
       npapi(false) {
   // Before parsing requirements from the manifest, automatically default the
   // NPAPI plugin requirement based on whether it includes NPAPI plugins.
@@ skipping 107 matching lines @@
       *error = ASCIIToUTF16(errors::kInvalidRequirements);
       return false;
     }
   }
 
   extension->SetManifestData(keys::kRequirements, requirements.release());
   return true;
 }
 
 }  // namespace extensions