Upstream rewrite of Instant.

chrome/browser/renderer_host/chrome_resource_dispatcher_host_delegate.cc

Index: chrome/browser/renderer_host/chrome_resource_dispatcher_host_delegate.cc
diff --git a/chrome/browser/renderer_host/chrome_resource_dispatcher_host_delegate.cc b/chrome/browser/renderer_host/chrome_resource_dispatcher_host_delegate.cc
index 21375335366c7f380a4e378bb8fdbc4a98afa155..be2287add4a0cad26024f031a7996113540df2cf 100644
--- a/chrome/browser/renderer_host/chrome_resource_dispatcher_host_delegate.cc
+++ b/chrome/browser/renderer_host/chrome_resource_dispatcher_host_delegate.cc
@@ -234,17 +234,6 @@ bool ChromeResourceDispatcherHostDelegate::AcceptAuthRequest(
 ResourceDispatcherHostLoginDelegate*
     ChromeResourceDispatcherHostDelegate::CreateLoginDelegate(
         net::AuthChallengeInfo* auth_info, net::URLRequest* request) {
-  std::string instant_header_value;
-  // For instant, return a NULL delegate. Auth navigations don't commit the load
-  // (the load remains pending) until the user cancels or succeeds in
-  // authorizing. Since we don't allow merging of WebContents with pending loads
-  // we disallow auth dialogs from showing during instant. Returning NULL does
-  // that.
-  // TODO: see if we can handle this case more robustly.
-  if (request->extra_request_headers().GetHeader(
-          InstantLoader::kInstantHeader, &instant_header_value) &&
-      instant_header_value == InstantLoader::kInstantHeaderValue)
-    return NULL;
   return CreateLoginPrompt(auth_info, request);
 }