Changes around how embed roots are set

mandoline/ui/desktop_ui/browser_window.cc

Index: mandoline/ui/desktop_ui/browser_window.cc
diff --git a/mandoline/ui/desktop_ui/browser_window.cc b/mandoline/ui/desktop_ui/browser_window.cc
index 24bc10f394aeebf6d4644f2a8894262ccf54c612..ee431af57bbe97c36b287bcc3a28e5015ff12b18 100644
--- a/mandoline/ui/desktop_ui/browser_window.cc
+++ b/mandoline/ui/desktop_ui/browser_window.cc
@@ -126,10 +126,6 @@ void BrowserWindow::OnEmbed(mojo::View* root) {
   // Record when the browser window was displayed, used for performance testing.
   const base::Time display_time = base::Time::Now();
 
-  // Make it so we get OnWillEmbed() for any Embed()s done by other apps we
-  // Embed().
-  root->connection()->SetEmbedRoot();
-
   root_ = root;
 
   host_->SetTitle("Mandoline");
@@ -142,6 +138,8 @@ void BrowserWindow::OnEmbed(mojo::View* root) {
   root_->AddChild(content_);
   content_->SetVisible(true);
 
+  content_->SetAccessPolicy(mojo::ViewTree::kAccessPolicyEmbedRoot);
+
   web_view_.Init(app_, content_);
 
   host_->AddAccelerator(BrowserCommand_Close, mojo::KEYBOARD_CODE_W,