Fix crash in NavigationHandle

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 129 matching lines @@
 
 bool NavigationHandleImpl::HasCommitted() {
   return state_ == DID_COMMIT || state_ == DID_COMMIT_ERROR_PAGE;
 }
 
 bool NavigationHandleImpl::IsErrorPage() {
   return state_ == DID_COMMIT_ERROR_PAGE;
 }
 
 void NavigationHandleImpl::Resume() {
-  CHECK(state_ == DEFERRING_START || state_ == DEFERRING_REDIRECT);
+  if (state_ != DEFERRING_START && state_ != DEFERRING_REDIRECT)
+    return;
+
   NavigationThrottle::ThrottleCheckResult result = NavigationThrottle::DEFER;
   if (state_ == DEFERRING_START) {
     result = CheckWillStartRequest();
   } else {
     result = CheckWillRedirectRequest();
   }
 
   if (result != NavigationThrottle::DEFER)
     RunCompleteCallback(result);
 }
@@ skipping 209 matching lines @@
 void NavigationHandleImpl::RunCompleteCallback(
     NavigationThrottle::ThrottleCheckResult result) {
   DCHECK(result != NavigationThrottle::DEFER);
   if (!complete_callback_.is_null())
     complete_callback_.Run(result);
 
   complete_callback_.Reset();
 }
 
 }  // namespace content