PlzNavigate: support the WebRequest API

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 1df20c234ad3452830cb9cb56400eede50dac696..41fe751128533e8b1053d5caa06d641ed42550d1 100644
--- a/content/browser/frame_host/navigation_handle_impl.cc
+++ b/content/browser/frame_host/navigation_handle_impl.cc
@@ -17,6 +17,7 @@
 #include "content/common/frame_messages.h"
 #include "content/common/resource_request_body_impl.h"
 #include "content/public/browser/content_browser_client.h"
+#include "content/public/browser/navigation_ui_data.h"
 #include "content/public/common/browser_side_navigation_policy.h"
 #include "content/public/common/content_client.h"
 #include "content/public/common/url_constants.h"
@@ -383,6 +384,9 @@ void NavigationHandleImpl::WillStartRequest(
 
   RegisterNavigationThrottles();
 
+  navigation_ui_data_ =
+      GetContentClient()->browser()->GetNavigationUIData(this);
+
   // Notify each throttle of the request.
   NavigationThrottle::ThrottleCheckResult result = CheckWillStartRequest();