Revert of Add RoutingIDIssuer to help track routing id issues.

content/renderer/dom_serializer_browsertest.cc

Index: content/renderer/dom_serializer_browsertest.cc
diff --git a/content/renderer/dom_serializer_browsertest.cc b/content/renderer/dom_serializer_browsertest.cc
index 45dac5bccbcb5b9c072d2e315ebf961822b4b524..b1759421b6c96b56c7f3312fbc19f8ec99c882cf 100644
--- a/content/renderer/dom_serializer_browsertest.cc
+++ b/content/renderer/dom_serializer_browsertest.cc
@@ -15,7 +15,6 @@
 #include "content/public/renderer/render_view_observer.h"
 #include "content/public/test/content_browser_test.h"
 #include "content/public/test/content_browser_test_utils.h"
-#include "content/public/test/routing_id_mangling_disabler.h"
 #include "content/public/test/test_utils.h"
 #include "content/renderer/savable_resources.h"
 #include "content/shell/browser/shell.h"
@@ -775,8 +774,6 @@
   // The local_directory_name_ is dummy relative path of directory which
   // contain all saved auxiliary files included all sub frames and resources.
   const base::FilePath local_directory_name_;
-
-  content::RoutingIDManglingDisabler mangling_disabler_;
 };
 
 // If original contents have document type, the serialized contents also have