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 9cfedcf3d3cd1f8e59ae3c803f5cd51dda910520..9ae4327357ad37777a7442985c24f154577f264e 100644
--- a/content/renderer/render_frame_impl.cc
+++ b/content/renderer/render_frame_impl.cc
@@ -1522,6 +1522,7 @@ 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)
@@ -4810,6 +4811,10 @@ void RenderFrameImpl::OnStop() {
     observer.OnStop();
 }
 
+void RenderFrameImpl::OnCollapse(bool collapsed) {
+  frame_->Collapse(collapsed);
+}
+
 void RenderFrameImpl::WasHidden() {
   for (auto& observer : observers_)
     observer.WasHidden();