Revert 180055: Very likely caused http://crbug.com/173885

chrome/browser/ui/webui/chrome_web_ui_controller_factory.cc

Index: chrome/browser/ui/webui/chrome_web_ui_controller_factory.cc
===================================================================
--- chrome/browser/ui/webui/chrome_web_ui_controller_factory.cc	(revision 180281)
+++ chrome/browser/ui/webui/chrome_web_ui_controller_factory.cc	(working copy)
@@ -45,6 +45,7 @@
 #include "chrome/browser/ui/webui/quota_internals_ui.h"
 #include "chrome/browser/ui/webui/signin_internals_ui.h"
 #include "chrome/browser/ui/webui/sync_internals_ui.h"
+#include "chrome/browser/ui/webui/tracing_ui.h"
 #include "chrome/browser/ui/webui/user_actions/user_actions_ui.h"
 #include "chrome/browser/ui/webui/version_ui.h"
 #include "chrome/common/chrome_switches.h"
@@ -284,6 +285,8 @@
     return &NewWebUI<options::OptionsUI>;
   if (url.host() == chrome::kChromeUISuggestionsInternalsHost)
     return &NewWebUI<SuggestionsInternalsUI>;
+  if (url.host() == chrome::kChromeUITracingHost)
+    return &NewWebUI<TracingUI>;
   // Uber frame is not used on Android.
   if (url.host() == chrome::kChromeUIUberFrameHost)
     return &NewWebUI<UberFrameUI>;