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 b95c691e3975168323163d65aa0197dbfcc15462..62b7571a55170184b83e082196bfef2c7ba07ca9 100644
--- a/content/browser/frame_host/navigation_handle_impl.cc
+++ b/content/browser/frame_host/navigation_handle_impl.cc
@@ -16,6 +16,7 @@
 #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 "net/url_request/redirect_info.h"
@@ -374,6 +375,9 @@ void NavigationHandleImpl::WillStartRequest(
 
   RegisterNavigationThrottles();
 
+  navigation_ui_data_ =
+      GetContentClient()->browser()->GetNavigationUIData(this);
+
   // Notify each throttle of the request.
   NavigationThrottle::ThrottleCheckResult result = CheckWillStartRequest();