Move small c/b/extensions classes into extensions namespace no.1

chrome/browser/extensions/convert_web_app.cc

 // Copyright (c) 2012 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/browser/extensions/convert_web_app.h"
 
 #include <cmath>
 #include <limits>
 #include <string>
 #include <vector>
@@ skipping 11 matching lines @@
 #include "chrome/common/chrome_paths.h"
 #include "chrome/common/extensions/extension.h"
 #include "chrome/common/extensions/extension_manifest_constants.h"
 #include "chrome/common/extensions/extension_file_util.h"
 #include "chrome/common/web_apps.h"
 #include "crypto/sha2.h"
 #include "googleurl/src/gurl.h"
 #include "third_party/skia/include/core/SkBitmap.h"
 #include "ui/gfx/codec/png_codec.h"
 
+namespace extensions {
+
 namespace keys = extension_manifest_keys;
 
 using base::Time;
-using extensions::Extension;
 
 namespace {
 
 const char kIconsDirName[] = "icons";
 
 // Create the public key for the converted web app.
 //
 // Web apps are not signed, but the public key for an extension doubles as
 // its unique identity, and we need one of those. A web app's unique identity
 // is its manifest URL, so we hash that to create a public key. There will be
@@ skipping 142 matching lines @@
       extension_flags,
       &error);
   if (!extension) {
     LOG(ERROR) << error;
     return NULL;
   }
 
   temp_dir.Take();  // The caller takes ownership of the directory.
   return extension;
 }
+
+}  // namespace extensions