Enable setVisibleOnAllWorkspaces on stable.

extensions/browser/api/app_current_window_internal/app_current_window_internal_api.cc

Index: extensions/browser/api/app_current_window_internal/app_current_window_internal_api.cc
diff --git a/extensions/browser/api/app_current_window_internal/app_current_window_internal_api.cc b/extensions/browser/api/app_current_window_internal/app_current_window_internal_api.cc
index 0248f4baf61370a5ac4b1b9b595181fde185fa8f..55774999b6a709e2215729071aa4a2a457afb10e 100644
--- a/extensions/browser/api/app_current_window_internal/app_current_window_internal_api.cc
+++ b/extensions/browser/api/app_current_window_internal/app_current_window_internal_api.cc
@@ -375,11 +375,6 @@ bool AppCurrentWindowInternalSetAlwaysOnTopFunction::RunWithWindow(
 
 bool AppCurrentWindowInternalSetVisibleOnAllWorkspacesFunction::RunWithWindow(
     AppWindow* window) {
-  if (AppWindowClient::Get()->IsCurrentChannelOlderThanDev()) {
-    error_ = kDevChannelOnly;
-    return false;
-  }
-
   scoped_ptr<SetVisibleOnAllWorkspaces::Params> params(
       SetVisibleOnAllWorkspaces::Params::Create(*args_));
   CHECK(params.get());