Ensure that the proper UA string is set while in incognito mode....

profile.cc

Index: profile.cc
===================================================================
--- profile.cc	(revision 9031)
+++ profile.cc	(working copy)
@@ -154,8 +154,7 @@
     prefs_->AddPrefObserver(prefs::kCookieBehavior, this);
   }
 
-  const std::string& GetUserAgent(
-        const GURL& url) const {
+  const std::string& GetUserAgent(const GURL& url) const {
     return webkit_glue::GetUserAgent(url);
   }
 
@@ -263,6 +262,10 @@
     prefs_->AddPrefObserver(prefs::kCookieBehavior, this);
   }
 
+  const std::string& GetUserAgent(const GURL& url) const {
+    return original_context_->GetUserAgent(url);
+  }
+
   // Since OffTheRecordProfileImpl maybe be destroyed after destroying
   // PrefService, but all PrefService observers are needed to clear in
   // before destroying PrefService. So we use to CleanupBeforeDestroy