Use explicit WebString <-> string16 conversion methods in storage API files

content/child/db_message_filter.cc

Index: content/child/db_message_filter.cc
diff --git a/content/child/db_message_filter.cc b/content/child/db_message_filter.cc
index 5c4045df4df91eb48bdce99f5016f24c41f184ef..2ad9e8f9ac60e177fcfe5b52e089f3e6d0d61aaa 100644
--- a/content/child/db_message_filter.cc
+++ b/content/child/db_message_filter.cc
@@ -39,7 +39,8 @@ void DBMessageFilter::OnDatabaseUpdateSize(const url::Origin& origin,
                                            const base::string16& database_name,
                                            int64_t database_size) {
   DCHECK(!origin.unique());
-  blink::WebDatabase::updateDatabaseSize(origin, database_name, database_size);
+  blink::WebDatabase::updateDatabaseSize(
+      origin, WebString::fromUTF16(database_name), database_size);
 }
 
 void DBMessageFilter::OnDatabaseUpdateSpaceAvailable(const url::Origin& origin,
@@ -57,7 +58,8 @@ void DBMessageFilter::OnDatabaseCloseImmediately(
     const url::Origin& origin,
     const base::string16& database_name) {
   DCHECK(!origin.unique());
-  blink::WebDatabase::closeDatabaseImmediately(origin, database_name);
+  blink::WebDatabase::closeDatabaseImmediately(
+      origin, WebString::fromUTF16(database_name));
 }
 
 }  // namespace content