Remove the HANDLED_EXTERNALLY status code.

content/browser/renderer_host/throttling_resource_handler.cc

Index: content/browser/renderer_host/throttling_resource_handler.cc
diff --git a/content/browser/renderer_host/throttling_resource_handler.cc b/content/browser/renderer_host/throttling_resource_handler.cc
index b833b7f3c21c2e0b3656d7fef8199e56f84a940e..d34fa7f911c944aea688baded6deeada2cef6c66 100644
--- a/content/browser/renderer_host/throttling_resource_handler.cc
+++ b/content/browser/renderer_host/throttling_resource_handler.cc
@@ -95,6 +95,10 @@ void ThrottlingResourceHandler::Cancel() {
   controller()->Cancel();
 }
 
+void ThrottlingResourceHandler::CancelWithError(int error) {
+  controller()->CancelWithError(error);
+}
+
 void ThrottlingResourceHandler::Resume() {
   switch (deferred_stage_) {
     case DEFERRED_NONE: