IndexedDB: Fix trivial cpplint.py errors

content/child/indexed_db/indexed_db_dispatcher_unittest.cc

Index: content/child/indexed_db/indexed_db_dispatcher_unittest.cc
diff --git a/content/child/indexed_db/indexed_db_dispatcher_unittest.cc b/content/child/indexed_db/indexed_db_dispatcher_unittest.cc
index 98f929e7322fbae01ab99d1c05172416b470fc8b..6bc4d5df4cdaea2ef325723e5cdf8b51febcfc4a 100644
--- a/content/child/indexed_db/indexed_db_dispatcher_unittest.cc
+++ b/content/child/indexed_db/indexed_db_dispatcher_unittest.cc
@@ -45,7 +45,8 @@ class MockCallbacks : public WebIDBCallbacks {
 
 class MockDispatcher : public IndexedDBDispatcher {
  public:
-  MockDispatcher(ThreadSafeSender* sender) : IndexedDBDispatcher(sender) {}
+  explicit MockDispatcher(ThreadSafeSender* sender)
+      : IndexedDBDispatcher(sender) {}
 
   virtual bool Send(IPC::Message* msg) OVERRIDE {
     delete msg;
@@ -133,7 +134,8 @@ namespace {
 
 class CursorCallbacks : public WebIDBCallbacks {
  public:
-  CursorCallbacks(scoped_ptr<WebIDBCursor>* cursor) : cursor_(cursor) {}
+  explicit CursorCallbacks(scoped_ptr<WebIDBCursor>* cursor)
+      : cursor_(cursor) {}
 
   virtual void onSuccess(const WebData&,
                          const WebVector<WebBlobInfo>&) OVERRIDE {}