Provide mutable members of UrlRequestContext via pure-virtual interface

sync/internal_api/public/http_bridge.h

Index: sync/internal_api/public/http_bridge.h
diff --git a/sync/internal_api/public/http_bridge.h b/sync/internal_api/public/http_bridge.h
index 15001c2182c737be774b1b36364b9607795dff9d..dd8bed9fb3018930cf31e6f4a170f0e3a5c55de0 100644
--- a/sync/internal_api/public/http_bridge.h
+++ b/sync/internal_api/public/http_bridge.h
@@ -24,6 +24,7 @@ class MessageLoop;
 class HttpBridgeTest;
 
 namespace net {
+class StaticHttpUserAgentSettings;
 class HttpResponseHeaders;
 class URLFetcher;
 }
@@ -58,12 +59,11 @@ class HttpBridge : public base::RefCountedThreadSafe<HttpBridge>,
     // The destructor MUST be called on the IO thread.
     virtual ~RequestContext();
 
-    virtual const std::string& GetUserAgent(const GURL& url) const OVERRIDE;
-
    private:
     net::URLRequestContext* const baseline_context_;
     const scoped_refptr<base::SingleThreadTaskRunner> network_task_runner_;
-    const std::string user_agent_;
+    scoped_ptr<net::StaticHttpUserAgentSettings>

[erikwright (departed), 2012/10/24 13:14:33]

This could be just HttpUserAgentSettings, right?

+        static_http_user_agent_settings_;
 
     DISALLOW_COPY_AND_ASSIGN(RequestContext);
   };