Added proper extension manifest parser for launcher_page.

extensions/common/common_manifest_handlers.cc

Index: extensions/common/common_manifest_handlers.cc
diff --git a/extensions/common/common_manifest_handlers.cc b/extensions/common/common_manifest_handlers.cc
index e652fe2d936da624f081fae8627cebc495685b35..1ce16373c5ee67246a00eaab203906082faa2e68 100644
--- a/extensions/common/common_manifest_handlers.cc
+++ b/extensions/common/common_manifest_handlers.cc
@@ -11,6 +11,7 @@
 #include "extensions/common/manifest_handlers/icons_handler.h"
 #include "extensions/common/manifest_handlers/incognito_info.h"
 #include "extensions/common/manifest_handlers/kiosk_mode_info.h"
+#include "extensions/common/manifest_handlers/launcher_page_info.h"
 #include "extensions/common/manifest_handlers/nacl_modules_handler.h"
 #include "extensions/common/manifest_handlers/offline_enabled_info.h"
 #include "extensions/common/manifest_handlers/sandboxed_page_info.h"
@@ -29,6 +30,7 @@ void RegisterCommonManifestHandlers() {
   (new IconsHandler)->Register();
   (new IncognitoHandler)->Register();
   (new KioskModeHandler)->Register();
+  (new LauncherPageHandler)->Register();
 #if !defined(DISABLE_NACL)
   (new NaClModulesHandler)->Register();
 #endif