[web-ui] Migrate RegisterMessageCallback usage to base::bind().

chrome/browser/ui/webui/chromeos/login/user_image_screen_handler.cc

Index: chrome/browser/ui/webui/chromeos/login/user_image_screen_handler.cc
===================================================================
--- chrome/browser/ui/webui/chromeos/login/user_image_screen_handler.cc	(revision 103795)
+++ chrome/browser/ui/webui/chromeos/login/user_image_screen_handler.cc	(working copy)
@@ -4,7 +4,8 @@
 
 #include "chrome/browser/ui/webui/chromeos/login/user_image_screen_handler.h"
 
-#include "base/callback.h"
+#include "base/bind.h"
+#include "base/bind_helpers.h"
 #include "base/logging.h"
 #include "base/values.h"
 #include "chrome/browser/chromeos/login/default_user_images.h"
@@ -117,15 +118,15 @@
 }
 
 void UserImageScreenHandler::RegisterMessages() {
-  web_ui_->RegisterMessageCallback(
-      "takePhoto",
-      NewCallback(this, &UserImageScreenHandler::HandleTakePhoto));
-  web_ui_->RegisterMessageCallback(
-      "selectImage",
-      NewCallback(this, &UserImageScreenHandler::HandleSelectImage));
-  web_ui_->RegisterMessageCallback(
-      "onUserImageAccepted",
-      NewCallback(this, &UserImageScreenHandler::HandleImageAccepted));
+  web_ui_->RegisterMessageCallback("takePhoto",
+      base::Bind(&UserImageScreenHandler::HandleTakePhoto,
+                 base::Unretained(this)));
+  web_ui_->RegisterMessageCallback("selectImage",
+      base::Bind(&UserImageScreenHandler::HandleSelectImage,
+                 base::Unretained(this)));
+  web_ui_->RegisterMessageCallback("onUserImageAccepted",
+      base::Bind(&UserImageScreenHandler::HandleImageAccepted,
+                 base::Unretained(this)));
 }
 
 void UserImageScreenHandler::OnPhotoAccepted(const SkBitmap& photo) {