Move StringToLowerASCII to base namespace

content/browser/service_worker/service_worker_fetch_stores_manager.cc

Index: content/browser/service_worker/service_worker_fetch_stores_manager.cc
diff --git a/content/browser/service_worker/service_worker_fetch_stores_manager.cc b/content/browser/service_worker/service_worker_fetch_stores_manager.cc
index 2fe44f21e5e25c22a386633581d80cd2f75780c1..88036af71bd3d0612cdac1bcd96b0f024063f814 100644
--- a/content/browser/service_worker/service_worker_fetch_stores_manager.cc
+++ b/content/browser/service_worker/service_worker_fetch_stores_manager.cc
@@ -22,7 +22,7 @@ namespace {
 base::FilePath ConstructOriginPath(const base::FilePath& root_path,
                                    const GURL& origin) {
   std::string origin_hash = base::SHA1HashString(origin.spec());
-  std::string origin_hash_hex = StringToLowerASCII(
+  std::string origin_hash_hex = base::StringToLowerASCII(
       base::HexEncode(origin_hash.c_str(), origin_hash.length()));
   return root_path.AppendASCII(origin_hash_hex);
 }