Introduce WebRequestEventRouterDelegate.

extensions/browser/api/web_request/web_request_api_helpers.h

Index: extensions/browser/api/web_request/web_request_api_helpers.h
diff --git a/extensions/browser/api/web_request/web_request_api_helpers.h b/extensions/browser/api/web_request/web_request_api_helpers.h
index 77129466b93a7a6a2d13564c43ab5db1c595b431..16f58a629cf459d795bc9f87a42d890d295bd866 100644
--- a/extensions/browser/api/web_request/web_request_api_helpers.h
+++ b/extensions/browser/api/web_request/web_request_api_helpers.h
@@ -41,6 +41,7 @@ class URLRequest;
 
 namespace extension_web_request_api_helpers {
 
+
 typedef std::pair<std::string, std::string> ResponseHeader;
 typedef std::vector<ResponseHeader> ResponseHeaders;
 
@@ -320,6 +321,11 @@ void NotifyWebRequestAPIUsed(
 // extensions are installed.
 void SendExtensionWebRequestStatusToHost(content::RenderProcessHost* host);
 
+// Converts the |name|, |value| pair of a http header to a HttpHeaders
+// dictionary. Ownership is passed to the caller.
+base::DictionaryValue* CreateHeaderDictionary(
+    const std::string& name, const std::string& value);
+
 }  // namespace extension_web_request_api_helpers
 
 #endif  // EXTENSIONS_BROWSER_API_WEB_REQUEST_WEB_REQUEST_API_HELPERS_H_