Remove keep-alive impulse IPCs from NaCl modules.

chrome/browser/nacl_host/nacl_browser_delegate_impl.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 CHROME_BROWSER_NACL_HOST_NACL_BROWSER_DELEGATE_IMPL_H_
 #define CHROME_BROWSER_NACL_HOST_NACL_BROWSER_DELEGATE_IMPL_H_
 
 #include <set>
 #include <string>
 
@@ skipping 27 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:
 #if BUILDFLAG(ENABLE_EXTENSIONS)
   scoped_refptr<extensions::InfoMap> GetExtensionInfoMap(
       const base::FilePath& profile_directory);
   std::vector<URLPattern> debug_patterns_;
 #endif
 
   ProfileManager* profile_manager_;
   bool inverse_debug_patterns_;
   std::set<std::string> allowed_nonsfi_origins_;
   DISALLOW_COPY_AND_ASSIGN(NaClBrowserDelegateImpl);
 };
 
 
 #endif  // CHROME_BROWSER_NACL_HOST_NACL_BROWSER_DELEGATE_IMPL_H_