mac: fix the overlay window position in macOS 26

Since macOS 26.0, when the main window enters full screen, the
overlay child window’s position is automatically adjusted by the system
to just below the menu bar location (even though the menu bar is hidden
at that time). During this process, [NSWindow constrainFrameRect] is
called and returns the system-adjusted position. Override this function
to return the original value frameRect before the adjustment.

Below is the stack trace:

```
remote_cocoa::ImmersiveModeTabbedControllerCocoa::Reanchor
  remote_cocoa::ImmersiveModeControllerCocoa::Reanchor
    remote_cocoa::ImmersiveModeControllerCocoa::LayoutWindowWithAnchorView
      -[NSWindow setFrameOrigin:]
        -[NSWindow _overrideDefeatingConstrainFrameRect:toScreen:fullScreenConstrainToTile:]
          -[NativeWidgetMacOverlayNSWindow constrainFrameRect:toScreen:]
```

Bug: 443655737

Change-Id: I82e80bc369c9d795d61aeff4e83546dd5f97fb42
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6918301
Reviewed-by: Mark Mentovai <mark@chromium.org>
Reviewed-by: Keren Zhu <kerenzhu@chromium.org>
Commit-Queue: Peng Zhou <zhoupeng.1996@bytedance.com>
Cr-Commit-Position: refs/heads/main@{#1513644}