Implement NavigationThrottle::BLOCK_REQUEST_AND_COLLAPSE.

content/renderer/render_frame_impl.cc

Index: content/renderer/render_frame_impl.cc
diff --git a/content/renderer/render_frame_impl.cc b/content/renderer/render_frame_impl.cc
index 80a60c017e7694c80b6632ff6461dfb5b60f444c..f253fb1a180637c5a3126243654865f07b451439 100644
--- a/content/renderer/render_frame_impl.cc
+++ b/content/renderer/render_frame_impl.cc
@@ -1547,6 +1547,7 @@ bool RenderFrameImpl::OnMessageReceived(const IPC::Message& msg) {
     IPC_MESSAGE_HANDLER(FrameMsg_SwapIn, OnSwapIn)
     IPC_MESSAGE_HANDLER(FrameMsg_Delete, OnDeleteFrame)
     IPC_MESSAGE_HANDLER(FrameMsg_Stop, OnStop)
+    IPC_MESSAGE_HANDLER(FrameMsg_Collapse, OnCollapse)
     IPC_MESSAGE_HANDLER(FrameMsg_ContextMenuClosed, OnContextMenuClosed)
     IPC_MESSAGE_HANDLER(FrameMsg_CustomContextMenuAction,
                         OnCustomContextMenuAction)
@@ -4892,6 +4893,10 @@ void RenderFrameImpl::OnStop() {
     observer.OnStop();
 }
 
+void RenderFrameImpl::OnCollapse(bool collapsed) {
+  frame_->Collapse(collapsed);
+}
+
 void RenderFrameImpl::WasHidden() {
   for (auto& observer : observers_)
     observer.WasHidden();