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

content/child/indexed_db/indexed_db_database_callbacks_impl.cc

Index: content/child/indexed_db/indexed_db_database_callbacks_impl.cc
diff --git a/content/child/indexed_db/indexed_db_database_callbacks_impl.cc b/content/child/indexed_db/indexed_db_database_callbacks_impl.cc
index 420424613e969890cc1b6e29b976986d51c900ae..904f80fb71fba8a7a8bb30e6f3ee6d6da2c3e1ab 100644
--- a/content/child/indexed_db/indexed_db_database_callbacks_impl.cc
+++ b/content/child/indexed_db/indexed_db_database_callbacks_impl.cc
@@ -26,7 +26,9 @@ void BuildErrorAndAbort(WebIDBDatabaseCallbacks* callbacks,
                         int64_t transaction_id,
                         int32_t code,
                         const base::string16& message) {
-  callbacks->onAbort(transaction_id, blink::WebIDBDatabaseError(code, message));
+  callbacks->onAbort(
+      transaction_id,
+      blink::WebIDBDatabaseError(code, blink::WebString::fromUTF16(message)));
 }
 
 void BuildObservationsAndNotify(WebIDBDatabaseCallbacks* callbacks,