Description of Change

Closes #30509.

Fixes an issue present in webView where the leave-html-full-screen event is not emitted if the user exits fullscreen with esc instead of by clicking into the webView.

This was happening because when the user exits by clicking into the webview, we call into ExitFullScreenModeFromTab on the webcontents of the webview - meaning the event is emitted correctly to the webview. When we do so from esc, however, this happens from the wrong webContents and so then go and loop through each child webview to ensure they all exit properly with api_web_contents->SetHtmlApiFullscreen(false);. Since the emit happens in ExitFullScreenModeFromTab though, leave-html-full-screen is not emitted again.

This fixes the issue by centralizing calls to Emit("enter-html-full-screen") and owner_window_->NotifyWindow{Enter|Leave}HtmlFullScreen().

Checklist

• PR description included and stakeholders cc'd
• npm test passes
• tests are changed or added
• PR release notes describe the change in a way relevant to app developers, and are capitalized, punctuated, and past tense.

Release Notes

Notes: Fixes an issue present in webView where the leave-html-full-screen event is not emitted if the user exits fullscreen with esc instead of by clicking into the webView.