Provide mutable members of UrlRequestContext via pure-virtual interface

chrome/browser/net/chrome_url_request_context.h

Index: chrome/browser/net/chrome_url_request_context.h
diff --git a/chrome/browser/net/chrome_url_request_context.h b/chrome/browser/net/chrome_url_request_context.h
index 7d20f4e1fe03cd3d6e09a1e92a1c527f2932c954..718bbf8c901fc680020c67328bdc7dbf8f37ee9d 100644
--- a/chrome/browser/net/chrome_url_request_context.h
+++ b/chrome/browser/net/chrome_url_request_context.h
@@ -14,6 +14,7 @@
 #include "net/url_request/url_request_context.h"
 #include "net/url_request/url_request_context_getter.h"
 
+class ChromeHttpUserAgentSettings;
 class ChromeURLDataManagerBackend;
 class ChromeURLRequestContextFactory;
 class IOThread;
@@ -52,8 +53,6 @@ class ChromeURLRequestContext : public net::URLRequestContext {
     return is_incognito_;
   }
 
-  virtual const std::string& GetUserAgent(const GURL& url) const OVERRIDE;
-
   // TODO(willchan): Get rid of the need for this accessor. Really, this should
   // move completely to ProfileIOData.
   ChromeURLDataManagerBackend* chrome_url_data_manager_backend() const;
@@ -82,6 +81,7 @@ class ChromeURLRequestContext : public net::URLRequestContext {
   ChromeURLDataManagerBackend* chrome_url_data_manager_backend_;
   bool is_incognito_;
   chrome_browser_net::LoadTimeStats* load_time_stats_;
+  scoped_ptr<ChromeHttpUserAgentSettings> chrome_http_user_agent_settings_;
 
   // ---------------------------------------------------------------------------
   // Important: When adding any new members above, consider whether they need to