Enable the ChromeFrame IHttpNegotiate patch for all IE versions. Ensure that ...

chrome_frame/http_negotiate.cc

 // Copyright (c) 2011 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.
 
 #include "chrome_frame/http_negotiate.h"
 
 #include <atlbase.h>
 #include <atlcom.h>
 #include <htiframe.h>
 
@@ skipping 213 matching lines @@
     LPCWSTR url, LPCWSTR headers, DWORD reserved, LPWSTR* additional_headers) {
   DVLOG(1) << __FUNCTION__ << " " << url << " headers:\n" << headers;
 
   HRESULT hr = original(me, url, headers, reserved, additional_headers);
 
   if (FAILED(hr)) {
     DLOG(WARNING) << __FUNCTION__ << " Delegate returned an error";
     return hr;
   }
   if (modify_user_agent_) {
-    std::string updated(AppendCFUserAgentString(headers, *additional_headers));
+    std::string updated_headers;
+    if (IsGcfDefaultRenderer() &&
+        RendererTypeForUrl(url) == RENDERER_TYPE_CHROME_DEFAULT_RENDERER) {
+      // Replace the user-agent header with Chrome's.
+      updated_headers = ReplaceOrAddUserAgent(*additional_headers,
+                                              http_utils::GetChromeUserAgent());
+    } else {
+      updated_headers = AppendCFUserAgentString(headers, *additional_headers);
+    }
     *additional_headers = reinterpret_cast<wchar_t*>(::CoTaskMemRealloc(
-        *additional_headers, (updated.length() + 1) * sizeof(wchar_t)));
-    lstrcpyW(*additional_headers, ASCIIToWide(updated).c_str());
+        *additional_headers,
+        (updated_headers.length() + 1) * sizeof(wchar_t)));
+    lstrcpyW(*additional_headers, ASCIIToWide(updated_headers).c_str());
   }
   return S_OK;
 }