Consolidate manifest handler registration.

chrome/browser/extensions/extension_process_manager.cc

Index: chrome/browser/extensions/extension_process_manager.cc
diff --git a/chrome/browser/extensions/extension_process_manager.cc b/chrome/browser/extensions/extension_process_manager.cc
index c1a257338ff3e19276e3a752041925afad1b1d6c..8ec9d896be7942a44f98413871bb132d79444c58 100644
--- a/chrome/browser/extensions/extension_process_manager.cc
+++ b/chrome/browser/extensions/extension_process_manager.cc
@@ -27,7 +27,6 @@
 #include "chrome/common/extensions/extension.h"
 #include "chrome/common/extensions/extension_messages.h"
 #include "chrome/common/extensions/incognito_handler.h"
-#include "chrome/common/extensions/manifest_handler.h"
 #include "chrome/common/extensions/manifest_url_handler.h"
 #include "chrome/common/url_constants.h"
 #include "content/public/browser/browser_thread.h"
@@ -178,9 +177,6 @@ ExtensionProcessManager::ExtensionProcessManager(Profile* profile)
         suspending_time_sec);
   }
 
-  (new BackgroundManifestHandler())->Register();
-  (new extensions::IncognitoHandler())->Register();
-
   content::DevToolsManager::GetInstance()->AddAgentStateCallback(
       devtools_callback_);
 }