IndexedDB: Fix trivial cpplint.py errors

content/browser/indexed_db/indexed_db_factory_unittest.cc

Index: content/browser/indexed_db/indexed_db_factory_unittest.cc
diff --git a/content/browser/indexed_db/indexed_db_factory_unittest.cc b/content/browser/indexed_db/indexed_db_factory_unittest.cc
index ba7de61b9a1df61f22ab0dfbe3ccb77035a310ce..975f9bcbcd355ea4d57a6a51c66127e75ca6d022 100644
--- a/content/browser/indexed_db/indexed_db_factory_unittest.cc
+++ b/content/browser/indexed_db/indexed_db_factory_unittest.cc
@@ -28,7 +28,8 @@ namespace {
 
 class MockIDBFactory : public IndexedDBFactory {
  public:
-  MockIDBFactory(IndexedDBContextImpl* context) : IndexedDBFactory(context) {}
+  explicit MockIDBFactory(IndexedDBContextImpl* context)
+      : IndexedDBFactory(context) {}
   scoped_refptr<IndexedDBBackingStore> TestOpenBackingStore(
       const GURL& origin,
       const base::FilePath& data_directory) {
@@ -198,7 +199,8 @@ TEST_F(IndexedDBFactoryTest, RejectLongOrigins) {
 
 class DiskFullFactory : public IndexedDBFactory {
  public:
-  DiskFullFactory(IndexedDBContextImpl* context) : IndexedDBFactory(context) {}
+  explicit DiskFullFactory(IndexedDBContextImpl* context)
+      : IndexedDBFactory(context) {}
 
  private:
   virtual ~DiskFullFactory() {}