[fsp] Fix unhappy MSAN build bots.

chrome/browser/chromeos/file_system_provider/queue.h

 // Copyright 2015 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 CHROME_BROWSER_CHROMEOS_FILE_SYSTEM_PROVIDER_QUEUE_H_
 #define CHROME_BROWSER_CHROMEOS_FILE_SYSTEM_PROVIDER_QUEUE_H_
 
 #include <deque>
 #include <map>
 
@@ skipping 54 matching lines @@
   // to remove the task from the queue if it hasn't been aborted earlier.
   // It must not be called more than one, nor for aborted tasks.
   void Complete(size_t token);
 
   // Removes the previously enqueued and completed task from the queue. Must not
   // be called for aborted, or not completed tasks. Must not be called more than
   // once.
   void Remove(size_t token);
 
  private:
-  struct Task;
+  // Information about an enqueued task which hasn't been removed, nor aborted.
+  struct Task {
+    Task();
+    Task(size_t token, const AbortableCallback& callback);
+    ~Task();
+
+    size_t token;
+    bool completed;
+    AbortableCallback callback;
+    AbortCallback abort_callback;
+  };
 
   // Runs the next task from the pending queue if there is less than
   // |max_in_parallel_| tasks running at once.
   void MaybeRun();
 
   // Aborts a previously enqueued task. Returns the result asynchronously via
   // |callback|. May be called at any time, but if already completed then
   // FILE_ERROR_INVALID_OPERATION error code will be returned.
   void Abort(size_t token,
              const storage::AsyncFileUtil::StatusCallback& callback);
 
   const size_t max_in_parallel_;
   size_t next_token_;
   std::deque<Task> pending_;
   std::map<int, Task> executed_;
 
   base::WeakPtrFactory<Queue> weak_ptr_factory_;
   DISALLOW_COPY_AND_ASSIGN(Queue);
 };
 
 }  // namespace file_system_provider
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_FILE_SYSTEM_PROVIDER_QUEUE_H_