FBTF: Fix more ctor/dtors found by clang plugin.

base/thread_checker.h

 // Copyright (c) 2010 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 BASE_THREAD_CHECKER_H_
 #define BASE_THREAD_CHECKER_H_
 #pragma once
 
 #include "base/platform_thread.h"
 #include "base/scoped_ptr.h"
@@ skipping 17 matching lines @@
 //     ... (do stuff) ...
 //   }
 // }
 //
 // In Release mode, CalledOnValidThread will always return true.
 //
 #ifndef NDEBUG
 class ThreadChecker {
  public:
   ThreadChecker();
+  ~ThreadChecker();
 
   bool CalledOnValidThread() const;
 
   // Changes the thread that is checked for in CalledOnValidThread.  This may
   // be useful when an object may be created on one thread and then used
   // exclusively on another thread.
   void DetachFromThread();
 
  private:
   void EnsureThreadIdAssigned() const;
 
   // This is mutable so that CalledOnValidThread can set it.
   mutable scoped_ptr<PlatformThreadId> valid_thread_id_;
 };
 #else
 // Do nothing in release mode.
 class ThreadChecker {
  public:
   bool CalledOnValidThread() const {
     return true;
   }
 
   void DetachFromThread() {}
 };
 #endif  // NDEBUG
 
 #endif  // BASE_THREAD_CHECKER_H_