Move UserScript and related into extensions namespace

chrome/browser/extensions/convert_user_script.cc

Index: chrome/browser/extensions/convert_user_script.cc
diff --git a/chrome/browser/extensions/convert_user_script.cc b/chrome/browser/extensions/convert_user_script.cc
index 92fadbdedf42e7e8f932bbc6ceacb2b86efa9ac6..4531ef09e990ffd937a4732847613d3dc61b07c0 100644
--- a/chrome/browser/extensions/convert_user_script.cc
+++ b/chrome/browser/extensions/convert_user_script.cc
@@ -24,11 +24,11 @@
 #include "crypto/sha2.h"
 #include "googleurl/src/gurl.h"
 
-using extensions::Extension;
-
 namespace keys = extension_manifest_keys;
 namespace values = extension_manifest_values;
 
+namespace extensions {
+
 scoped_refptr<Extension> ConvertUserScriptToExtension(
     const FilePath& user_script_path, const GURL& original_url,
     string16* error) {
@@ -187,3 +187,5 @@ scoped_refptr<Extension> ConvertUserScriptToExtension(
   temp_dir.Take();  // The caller takes ownership of the directory.
   return extension;
 }
+
+}  // namespace extensions