Add navigator.doNotTrack property

content/renderer/render_view_impl.h

Index: content/renderer/render_view_impl.h
diff --git a/content/renderer/render_view_impl.h b/content/renderer/render_view_impl.h
index c9df7b72faa8bdde1d08fae8a452b8d5a9845150..33104d4d08a1c4b04c255f86d4cf0d3d6479b31c 100644
--- a/content/renderer/render_view_impl.h
+++ b/content/renderer/render_view_impl.h
@@ -252,6 +252,10 @@ class RenderViewImpl : public RenderWidget,
     return webkit_preferences_;
   }
 
+  bool enable_do_not_track() const {
+    return renderer_preferences_.enable_do_not_track;
+  }
+
   void set_send_content_state_immediately(bool value) {
     send_content_state_immediately_ = value;
   }