Remove keep-alive impulse IPCs from NaCl modules.

extensions/shell/browser/shell_nacl_browser_delegate.h

 // Copyright 2014 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 EXTENSIONS_SHELL_BROWSER_SHELL_NACL_BROWSER_DELEGATE_H_
 #define EXTENSIONS_SHELL_BROWSER_SHELL_NACL_BROWSER_DELEGATE_H_
 
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "components/nacl/browser/nacl_browser_delegate.h"
@@ skipping 23 matching lines @@
   bool GetUserDirectory(base::FilePath* user_dir) override;
   std::string GetVersionString() const override;
   ppapi::host::HostFactory* CreatePpapiHostFactory(
       content::BrowserPpapiHost* ppapi_host) override;
   bool MapUrlToLocalFilePath(const GURL& url,
                              bool is_blocking,
                              const base::FilePath& profile_directory,
                              base::FilePath* file_path) override;
   void SetDebugPatterns(const std::string& debug_patterns) override;
   bool URLMatchesDebugPatterns(const GURL& manifest_url) override;
-  content::BrowserPpapiHost::OnKeepaliveCallback GetOnKeepaliveCallback()
-      override;
   bool IsNonSfiModeAllowed(const base::FilePath& profile_directory,
                            const GURL& manifest_url) override;
 
  private:
   content::BrowserContext* browser_context_;  // Not owned.
 
   DISALLOW_COPY_AND_ASSIGN(ShellNaClBrowserDelegate);
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_SHELL_BROWSER_SHELL_NACL_BROWSER_DELEGATE_H_