The `GetTitlebarBounds().height()` is obviously intended to be placed in
the `top` parameter, which used to be the second one before upstream
removed multi-parameter `gfx::Rect::Inset`, but it's the first parameter
for `gfx::Insets::TLBR`, which was intended to replace the removed
`Inset` function. However, whoever updated Chromium kept the parameter
unchanged, causing the title bar height to be passed to the `left`
parameter, causing the window title bar to be unclickable.

Use NonClientFrameView::TargetForRect for the ClientFrameViewLinux
implementation because the default inherited from FramelessView blocks
any non-HTCLIENT events.

This ensures that the toolkit renders the window decorations in maximized mode
while the window is maximized to ensure that there is no empty space around the window.