Use rewritten url of a tab to find the zoom level from zoom map. Zoom map is

content/browser/tab_contents/tab_contents.cc

 // Copyright (c) 2011 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.
 
 #include "content/browser/tab_contents/tab_contents.h"
 
 #include <cmath>
 
 #include "base/command_line.h"
 #include "base/metrics/histogram.h"
@@ skipping 802 matching lines @@
 double TabContents::GetZoomLevel() const {
   HostZoomMap* zoom_map = browser_context()->GetHostZoomMap();
   if (!zoom_map)
     return 0;
 
   double zoom_level;
   if (temporary_zoom_settings_) {
     zoom_level = zoom_map->GetTemporaryZoomLevel(
         GetRenderProcessHost()->id(), render_view_host()->routing_id());
   } else {
-    zoom_level = zoom_map->GetZoomLevel(net::GetHostOrSpecFromURL(GetURL()));
+    GURL url;
+    NavigationEntry* active_entry = controller().GetActiveEntry();
+    // Since zoom map is updated using rewritten URL, use rewritten URL
+    // to get the zoom level.
+    url = active_entry ? active_entry->url() : GURL::EmptyGURL();
+    zoom_level = zoom_map->GetZoomLevel(net::GetHostOrSpecFromURL(url));
   }
   return zoom_level;
 }
 
 int TabContents::GetZoomPercent(bool* enable_increment,
                                 bool* enable_decrement) {
   *enable_decrement = *enable_increment = false;
   int percent = static_cast<int>(
       WebKit::WebView::zoomLevelToZoomFactor(GetZoomLevel()) * 100);
   *enable_decrement = percent > minimum_zoom_percent_;
@@ skipping 1137 matching lines @@
 
 void TabContents::set_encoding(const std::string& encoding) {
   encoding_ = content::GetContentClient()->browser()->
       GetCanonicalEncodingNameByAliasName(encoding);
 }
 
 void TabContents::CreateViewAndSetSizeForRVH(RenderViewHost* rvh) {
   RenderWidgetHostView* rwh_view = view()->CreateViewForWidget(rvh);
   rwh_view->SetSize(view()->GetContainerSize());
 }