Update NavigationHandleImpl#GetResponseHeaders method.

content/browser/frame_host/navigation_handle_impl.cc

 // Copyright 2015 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 "content/browser/frame_host/navigation_handle_impl.h"
 
 #include <utility>
 
 #include "content/browser/frame_host/frame_tree_node.h"
 #include "content/browser/frame_host/navigator.h"
@@ skipping 114 matching lines @@
   return render_frame_host_;
 }
 
 bool NavigationHandleImpl::IsSamePage() {
   DCHECK(state_ == DID_COMMIT || state_ == DID_COMMIT_ERROR_PAGE)
       << "This accessor should not be called before the navigation has "
          "committed.";
   return is_same_page_;
 }
 
+bool NavigationHandleImpl::HasResponseHeaders() const {
+  return state_ >= WILL_REDIRECT_REQUEST && response_headers_.get();

[clamy, 2016/02/09 10:42:40]

nit: the state_ >= WILL_REDIRECT_REQUEST is not really useful here since
response_headers_ should always be null before we reach that state.

[Donn Denman, 2016/02/10 01:05:05]

Done.

+}
+
 const net::HttpResponseHeaders* NavigationHandleImpl::GetResponseHeaders() {
   DCHECK(state_ >= WILL_REDIRECT_REQUEST)
       << "This accessor should only be called when the request encountered a "
          "redirect or received a response";
    return response_headers_.get();
 }
 
 bool NavigationHandleImpl::HasCommitted() {
   return state_ == DID_COMMIT || state_ == DID_COMMIT_ERROR_PAGE;
 }
@@ skipping 300 matching lines @@
   complete_callback_.Reset();
 
   if (!callback.is_null())
     callback.Run(result);
 
   // No code after running the callback, as it might have resulted in our
   // destruction.
 }
 
 }  // namespace content