Require WebLocalFrame to be created with a non-null client

extensions/renderer/scoped_web_frame.cc

Index: extensions/renderer/scoped_web_frame.cc
diff --git a/extensions/renderer/scoped_web_frame.cc b/extensions/renderer/scoped_web_frame.cc
index e2e011194cb51caeccc9eb9185f2c642d5cb8286..60066b3bc1501d515869813192235a138cd69c76 100644
--- a/extensions/renderer/scoped_web_frame.cc
+++ b/extensions/renderer/scoped_web_frame.cc
@@ -10,14 +10,13 @@ namespace extensions {
 
 ScopedWebFrame::ScopedWebFrame() : view_(nullptr), frame_(nullptr) {
   view_ = blink::WebView::create(nullptr, blink::WebPageVisibilityStateVisible);
-  frame_ = blink::WebLocalFrame::create(
-      blink::WebTreeScopeType::Document, nullptr);
+  frame_ = blink::WebLocalFrame::create(blink::WebTreeScopeType::Document,
+                                        &frame_client_);
   view_->setMainFrame(frame_);
 }
 
 ScopedWebFrame::~ScopedWebFrame() {
   view_->close();
-  frame_->close();
   blink::WebHeap::collectAllGarbageForTesting();
 }