Enable use_once_callback for //content/common/*.mojom

content/browser/leveldb_wrapper_impl.h

 // Copyright 2016 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_LEVELDB_WRAPPER_IMPL_H_
 #define CONTENT_BROWSER_LEVELDB_WRAPPER_IMPL_H_
 
 #include <map>
 #include <memory>
 #include <string>
@@ skipping 65 matching lines @@
 
   // Clears the in-memory cache if currently no changes are pending. If there
   // are uncommitted changes this method does nothing.
   void PurgeMemory();
 
   // LevelDBWrapper:
   void AddObserver(mojom::LevelDBObserverAssociatedPtrInfo observer) override;
   void Put(const std::vector<uint8_t>& key,
            const std::vector<uint8_t>& value,
            const std::string& source,
-           const PutCallback& callback) override;
+           PutCallback callback) override;
   void Delete(const std::vector<uint8_t>& key,
               const std::string& source,
-              const DeleteCallback& callback) override;
+              DeleteCallback callback) override;
   void DeleteAll(const std::string& source,
-                 const DeleteAllCallback& callback) override;
-  void Get(const std::vector<uint8_t>& key,
-           const GetCallback& callback) override;
+                 DeleteAllCallback callback) override;
+  void Get(const std::vector<uint8_t>& key, GetCallback callback) override;
   void GetAll(
       mojom::LevelDBWrapperGetAllCallbackAssociatedPtrInfo complete_callback,
-      const GetAllCallback& callback) override;
+      GetAllCallback callback) override;
 
  private:
   // Used to rate limit commits.
   class RateLimiter {
    public:
     RateLimiter(size_t desired_rate, base::TimeDelta time_quantum);
 
     void add_samples(size_t samples) { samples_ += samples;  }
 
     // Computes the total time needed to process the total samples seen
@@ skipping 50 matching lines @@
   base::WeakPtrFactory<LevelDBWrapperImpl> weak_ptr_factory_;
 
   static bool s_aggressive_flushing_enabled_;
 
   DISALLOW_COPY_AND_ASSIGN(LevelDBWrapperImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_LEVELDB_WRAPPER_IMPL_H_