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

content/browser/frame_host/render_frame_host_impl.h

Index: content/browser/frame_host/render_frame_host_impl.h
diff --git a/content/browser/frame_host/render_frame_host_impl.h b/content/browser/frame_host/render_frame_host_impl.h
index 5c6ebdb106a04e887727ef01f4cd833a1213b543..36b61ca23329b38ce6668064a575d14db0c1e336 100644
--- a/content/browser/frame_host/render_frame_host_impl.h
+++ b/content/browser/frame_host/render_frame_host_impl.h
@@ -9,6 +9,7 @@
 #include <stdint.h>
 
 #include <map>
+#include <memory>
 #include <set>
 #include <string>
 #include <vector>
@@ -23,6 +24,7 @@
 #include "build/build_config.h"
 #include "content/browser/accessibility/browser_accessibility_manager.h"
 #include "content/browser/bad_message.h"
+#include "content/browser/host_zoom_map_host.h"
 #include "content/browser/loader/global_routing_id.h"
 #include "content/browser/site_instance_impl.h"
 #include "content/browser/webui/web_ui_impl.h"
@@ -1051,6 +1053,8 @@ class CONTENT_EXPORT RenderFrameHostImpl
   std::unique_ptr<AssociatedInterfaceProviderImpl>
       remote_associated_interfaces_;
 
+  std::unique_ptr<HostZoomMapHost> host_zoom_map_host_;
+
   // NOTE: This must be the last member.
   base::WeakPtrFactory<RenderFrameHostImpl> weak_ptr_factory_;