Move the "extension" namespace from extension_api.json into extension_api_extension.json.

chrome/browser/extensions/extension_clear_api.cc

 // Copyright (c) 2011 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.
 
 // Defines the Chrome Extensions Clear API functions, which entail
 // clearing browsing data, and clearing the browser's cache (which, let's be
 // honest, are the same thing), as specified in
-// chrome/common/extensions/api/extension_api.json.
+// chrome/common/extensions/api/.
 
 #include "chrome/browser/extensions/extension_clear_api.h"
 
 #include <string>
 
 #include "base/values.h"
 #include "chrome/browser/browsing_data_remover.h"
 #include "chrome/browser/extensions/extension_clear_api_constants.h"
 #include "chrome/browser/plugin_data_remover_helper.h"
 #include "chrome/browser/plugin_prefs.h"
@@ skipping 152 matching lines @@
   return BrowsingDataRemover::REMOVE_FORM_DATA;
 }
 
 int ClearHistoryFunction::GetRemovalMask() const {
   return BrowsingDataRemover::REMOVE_HISTORY;
 }
 
 int ClearPasswordsFunction::GetRemovalMask() const {
   return BrowsingDataRemover::REMOVE_CACHE;
 }