Remove dead extensions tracking code.

extensions/browser/api/web_request/web_request_api_helpers.h

 // Copyright (c) 2012 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.
 
 // Helper classes and functions used for the WebRequest API.
 
 #ifndef EXTENSIONS_BROWSER_API_WEB_REQUEST_WEB_REQUEST_API_HELPERS_H_
 #define EXTENSIONS_BROWSER_API_WEB_REQUEST_WEB_REQUEST_API_HELPERS_H_
 
 #include <list>
@@ skipping 311 matching lines @@
 // Returns whether authentication credentials are set.
 bool MergeOnAuthRequiredResponses(
     const EventResponseDeltas& deltas,
     net::AuthCredentials* auth_credentials,
     extensions::WarningSet* conflicting_extensions,
     const net::NetLogWithSource* net_log);
 
 // Triggers clearing each renderer's in-memory cache the next time it navigates.
 void ClearCacheOnNavigation();
 
-// Tells renderer processes that the web request or declarative web request
-// API has been used by the extension with the given |extension_id| in the
-// given |browser_context_id| to collect UMA statistics on Page Load Times.
-// Needs to be called on the UI thread.
-void NotifyWebRequestAPIUsed(void* browser_context_id,
-                             const std::string& extension_id);
-
-// Send updates to |host| with information about what webRequest-related
-// extensions are installed.
-void SendExtensionWebRequestStatusToHost(content::RenderProcessHost* host);
-
 // Converts the |name|, |value| pair of a http header to a HttpHeaders
 // dictionary.
 std::unique_ptr<base::DictionaryValue> CreateHeaderDictionary(
     const std::string& name,
     const std::string& value);
 
 // Returns whether |type| is a ResourceType that is handled by the web request
 // API.
 bool IsRelevantResourceType(content::ResourceType type);
 
 // Returns a string representation of |type| or |other| if |type| is not handled
 // by the web request API.
 const char* ResourceTypeToString(content::ResourceType type);
 
 // Stores a |content::ResourceType| representation in |types| if |type_str| is
 // a resource type handled by the web request API. Returns true in case of
 // success.
 bool ParseResourceType(const std::string& type_str,
                        std::vector<content::ResourceType>* types);
 
 }  // namespace extension_web_request_api_helpers
 
 #endif  // EXTENSIONS_BROWSER_API_WEB_REQUEST_WEB_REQUEST_API_HELPERS_H_