Fix page zoom for plug-in documents (PDF, etc.)

content/public/common/renderer_preferences.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/public/common/renderer_preferences.h"
 
 namespace content {
 
 RendererPreferences::RendererPreferences()
     : can_accept_load_drops(true),
       should_antialias_text(true),
       hinting(RENDERER_PREFERENCES_HINTING_SYSTEM_DEFAULT),
       subpixel_rendering(
           RENDERER_PREFERENCES_SUBPIXEL_RENDERING_SYSTEM_DEFAULT),
       focus_ring_color(0),
       thumb_active_color(0),
       thumb_inactive_color(0),
       track_color(0),
       active_selection_bg_color(0),
       active_selection_fg_color(0),
       inactive_selection_bg_color(0),
       inactive_selection_fg_color(0),
       browser_handles_top_level_requests(false),
       caret_blink_interval(0),
-      enable_referrers(true) {
+      enable_referrers(true),
+      default_zoom_level(0) {
 }
 
 }  // namespace content