sandbox/win: Fix warnings found by clang chromium-style plugin on Windows.

sandbox/win/src/win2k_threadpool.h

 // Copyright (c) 2012 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 SANDBOX_SRC_WIN2K_THREADPOOL_H_
 #define SANDBOX_SRC_WIN2K_THREADPOOL_H_
 
 #include <list>
 #include <algorithm>
 #include "sandbox/win/src/crosscall_server.h"
 
 namespace sandbox {
 
 // Win2kThreadPool a simple implementation of a thread provider as required
 // for the sandbox IPC subsystem. See sandbox\crosscall_server.h for the details
 // and requirements of this interface.
 //
 // Implementing the thread provider as a thread pool is desirable in the case
 // of shared memory IPC because it can generate a large number of waitable
 // events: as many as channels. A thread pool does not create a thread per
 // event, instead maintains a few idle threads but can create more if the need
 // arises.
 //
 // This implementation simply thunks to the nice thread pool API of win2k.
 class Win2kThreadPool : public ThreadProvider {
  public:
-  Win2kThreadPool() {
-    ::InitializeCriticalSection(&lock_);
-  }
+  Win2kThreadPool();
   virtual ~Win2kThreadPool();
 
   virtual bool RegisterWait(const void* cookie, HANDLE waitable_object,
                             CrossCallIPCCallback callback,
                             void* context);
 
   virtual bool UnRegisterWaits(void* cookie);
 
   // Returns the total number of wait objects associated with
   // the thread pool.
   size_t OutstandingWaits();
 
  private:
   // record to keep track of a wait and its associated cookie.
   struct PoolObject {
     const void* cookie;
     HANDLE wait;
   };
   // The list of pool wait objects.
   typedef std::list<PoolObject> PoolObjects;
   PoolObjects pool_objects_;
   // This lock protects the list of pool wait objects.
   CRITICAL_SECTION lock_;
+
   DISALLOW_COPY_AND_ASSIGN(Win2kThreadPool);
 };
 
 }  // namespace sandbox
 
 #endif  // SANDBOX_SRC_WIN2K_THREADPOOL_H_