fix: make draggable regions work when devtools is opened on macOS

[trop]

Backport of #26361

See that PR for details.

Notes: Fix draggable regions stops working when devtools is opened on macOS

build failure

[codebytere]

../../electron/shell/browser/api/electron_api_browser_window_mac.mm:39:21: error: out-of-line definition of 'OnDevToolsResized' does not match any declaration in 'electron::api::BrowserWindow'
void BrowserWindow::OnDevToolsResized() {
                    ^~~~~~~~~~~~~~~~~
1 error generated.
[3 processes, 552/623 @ 8.6/s : 64.546s] OBJCXX obj/electron/electron_framework_shared_library/electron_library_main.o
[2 processes, 553/623 @ 8.2/s : 67.295s] CXX obj/electron/electron_lib/electron_api_app.o
[1 processes, 554/623 @ 6.5/s : 85.323s] CXX obj/electron/electron_lib/tabs_api.o
ninja: build stopped: subcommand failed.

[zcbenz]

The build failure has been fixed.

[release-clerk]

Release Notes Persisted

Fix draggable regions stops working when devtools is opened on macOS