IndexedDB: Fix trivial cpplint.py errors

content/child/indexed_db/indexed_db_dispatcher_unittest.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/memory/scoped_ptr.h"
 #include "base/message_loop/message_loop_proxy.h"
 #include "base/values.h"
 #include "content/child/indexed_db/indexed_db_dispatcher.h"
 #include "content/child/indexed_db/webidbcursor_impl.h"
 #include "content/child/thread_safe_sender.h"
@@ skipping 27 matching lines @@
   bool error_seen() const { return error_seen_; }
 
  private:
   bool error_seen_;
 
   DISALLOW_COPY_AND_ASSIGN(MockCallbacks);
 };
 
 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;
     return true;
   }
 
  private:
   DISALLOW_COPY_AND_ASSIGN(MockDispatcher);
 };
 
@@ skipping 67 matching lines @@
                                    WebVector<long long>(),
                                    WebVector<WebVector<WebIDBKey> >());
 
   EXPECT_TRUE(callbacks.error_seen());
 }
 
 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 {}
   virtual void onSuccess(WebIDBCursor* cursor,
                          const WebIDBKey& key,
                          const WebIDBKey& primaryKey,
                          const WebData& value,
                          const WebVector<WebBlobInfo>&) OVERRIDE {
     cursor_->reset(cursor);
   }
@@ skipping 187 matching lines @@
                                       cursor1_transaction_id);
 
   EXPECT_EQ(2, cursor1->reset_count());
   EXPECT_EQ(0, cursor2->reset_count());
 
   cursor1.reset();
   cursor2.reset();
 }
 
 }  // namespace content