Remove usage of HostZoomMap from c/b/loader via ReadyToCommitNavigation

content/browser/frame_host/render_frame_host_impl.cc

Index: content/browser/frame_host/render_frame_host_impl.cc
diff --git a/content/browser/frame_host/render_frame_host_impl.cc b/content/browser/frame_host/render_frame_host_impl.cc
index bcfd886f3c2bc284e01c379adaaf6c68577f4916..2e1d66fb77f708b43e9161dbcb9430cc869780ca 100644
--- a/content/browser/frame_host/render_frame_host_impl.cc
+++ b/content/browser/frame_host/render_frame_host_impl.cc
@@ -34,6 +34,7 @@
 #include "content/browser/frame_host/render_frame_host_delegate.h"
 #include "content/browser/frame_host/render_frame_proxy_host.h"
 #include "content/browser/frame_host/render_widget_host_view_child_frame.h"
+#include "content/browser/host_zoom_map_observer.h"
 #include "content/browser/loader/resource_dispatcher_host_impl.h"
 #include "content/browser/permissions/permission_service_context.h"
 #include "content/browser/permissions/permission_service_impl.h"
@@ -309,6 +310,9 @@ RenderFrameHostImpl::RenderFrameHostImpl(SiteInstance* site_instance,
         static_cast<InputRouterImpl*>(render_widget_host_->input_router());
     ir->SetFrameTreeNodeId(frame_tree_node_->frame_tree_node_id());
   }
+
+  if (delegate_->GetAsWebContents())
+    HostZoomMapObserver::CreateForWebContents(delegate->GetAsWebContents());

[nasko, 2016/10/17 22:49:03]

Why create the observer here? If it is per WebContents, it should be created in
the WebContents constructor, no?

[scottmg, 2016/10/25 20:12:40]

Why, indeed. Done.

 }
 
 RenderFrameHostImpl::~RenderFrameHostImpl() {