Service Workers: Clean up cpplint.py warnings

content/browser/service_worker/embedded_worker_test_helper.h

 // Copyright 2014 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.
 
 #ifndef CONTENT_BROWSER_SERVICE_WORKER_EMBEDDED_WORKER_TEST_HELPER_H_
 #define CONTENT_BROWSER_SERVICE_WORKER_EMBEDDED_WORKER_TEST_HELPER_H_
 
 #include <vector>
 
 #include "base/callback.h"
@@ skipping 27 matching lines @@
 // Alternatively consumers can subclass this helper and override On*()
 // methods to add their own logic/verification code.
 //
 // See embedded_worker_instance_unittest.cc for example usages.
 //
 class EmbeddedWorkerTestHelper : public IPC::Sender,
                                  public IPC::Listener {
  public:
   // Initialize this helper for |context|, and enable this as an IPC
   // sender for |mock_render_process_id|.
-  EmbeddedWorkerTestHelper(int mock_render_process_id);
+  explicit EmbeddedWorkerTestHelper(int mock_render_process_id);
   virtual ~EmbeddedWorkerTestHelper();
 
   // Call this to simulate add/associate a process to a worker.
   // This also registers this sender for the process.
   void SimulateAddProcessToWorker(int embedded_worker_id, int process_id);
 
   // IPC::Sender implementation.
   virtual bool Send(IPC::Message* message) OVERRIDE;
 
   // IPC::Listener implementation.
@@ skipping 67 matching lines @@
   int current_embedded_worker_id_;
 
   base::WeakPtrFactory<EmbeddedWorkerTestHelper> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(EmbeddedWorkerTestHelper);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_SERVICE_WORKER_EMBEDDED_WORKER_TEST_HELPER_H_