Make sure NavigationHandleImpl::WillStartRequest only executes once

content/browser/frame_host/navigation_handle_impl.cc

Index: content/browser/frame_host/navigation_handle_impl.cc
diff --git a/content/browser/frame_host/navigation_handle_impl.cc b/content/browser/frame_host/navigation_handle_impl.cc
index 9e6c1fc1bd3e8a03ad3babb122673881e34a2ad4..4f024e887254fe4a23cbcc25cc955ddb79c04f2c 100644
--- a/content/browser/frame_host/navigation_handle_impl.cc
+++ b/content/browser/frame_host/navigation_handle_impl.cc
@@ -570,6 +570,13 @@ void NavigationHandleImpl::WillStartRequest(
     const ThrottleChecksFinishedCallback& callback) {
   TRACE_EVENT_ASYNC_STEP_INTO0("navigation", "NavigationHandle", this,
                                "WillStartRequest");
+  // WillStartRequest should only be called once.
+  if (state_ != INITIAL) {
+    state_ = CANCELING;
+    RunCompleteCallback(NavigationThrottle::CANCEL);
+    return;
+  }
+
   if (method != "POST")
     DCHECK(!resource_request_body);