Remove indexed_db_messages.h.

content/browser/indexed_db/mock_indexed_db_callbacks.h

 // Copyright 2013 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_INDEXED_DB_MOCK_INDEXED_DB_CALLBACKS_H_
 #define CONTENT_BROWSER_INDEXED_DB_MOCK_INDEXED_DB_CALLBACKS_H_
 
 #include <stdint.h>
 
 #include <vector>
 
 #include "base/macros.h"
 #include "content/browser/indexed_db/indexed_db_callbacks.h"
 #include "content/browser/indexed_db/indexed_db_connection.h"
 
 namespace content {
 
 class MockIndexedDBCallbacks : public IndexedDBCallbacks {
  public:
   MockIndexedDBCallbacks();
   explicit MockIndexedDBCallbacks(bool expect_connection);
 
   void OnSuccess() override;
   void OnSuccess(int64_t result) override;
   void OnSuccess(const std::vector<base::string16>& result) override;
   void OnSuccess(const IndexedDBKey& key) override;
   void OnSuccess(std::unique_ptr<IndexedDBConnection> connection,
                  const IndexedDBDatabaseMetadata& metadata) override;
-  bool IsValid() const override;
   IndexedDBConnection* connection() { return connection_.get(); }
 
  protected:
   ~MockIndexedDBCallbacks() override;
 
   std::unique_ptr<IndexedDBConnection> connection_;
 
  private:
   bool expect_connection_;
 
   DISALLOW_COPY_AND_ASSIGN(MockIndexedDBCallbacks);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_INDEXED_DB_MOCK_INDEXED_DB_CALLBACKS_H_