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

content/common/host_zoom.mojom

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-module url.mojom;
+module content.mojom;
 
-import "url/mojo/origin.mojom";
 import "url/mojo/url.mojom";
 
-interface UrlTest {
-  [Sync]
-  BounceUrl(Url in) => (Url out);
-
-  [Sync]
-  BounceOrigin(Origin in) => (Origin out);
+interface HostZoom {
+  // Sets the host zoom level for the given url, called just before commit.
+  SetHostZoomLevel(url.mojom.Url url, double zoom_level);
 };