Expose the chrome.windows.* API to platform apps.

chrome/common/extensions/extension_permission_set.cc

Index: chrome/common/extensions/extension_permission_set.cc
diff --git a/chrome/common/extensions/extension_permission_set.cc b/chrome/common/extensions/extension_permission_set.cc
index 18e1fec22970d6b59a6b6b08360397a30bf275a9..6f55e7664a3d3109ff5405e0ee51404b04737f4a 100644
--- a/chrome/common/extensions/extension_permission_set.cc
+++ b/chrome/common/extensions/extension_permission_set.cc
@@ -259,7 +259,7 @@ void ExtensionAPIPermission::RegisterAllPermissions(
   info->RegisterPermission(
       kTab, "tabs", IDS_EXTENSION_PROMPT_WARNING_TABS,
       ExtensionPermissionMessage::kTabs, kFlagNone,
-      kTypeDefault - kTypePlatformApp);
+      kTypeDefault);
   info->RegisterPermission(
       kTts, "tts", 0,
       ExtensionPermissionMessage::kNone, kFlagCannotBeOptional, kTypeDefault);
@@ -372,6 +372,8 @@ void ExtensionAPIPermission::RegisterAllPermissions(
 
   // Register aliases.
   info->RegisterAlias("unlimitedStorage", kOldUnlimitedStoragePermission);
+  // TODO(mihaip): Remove this alias for platform apps, and only give them
+  // access to the chrome.windows.* APIs, but not the chrome.tabs.* ones.
   info->RegisterAlias("tabs", kWindowsPermission);
 }