* Electron version: 1.4.15
* Operating system: Windows 10

### Actual behavior

Height is oversized by exactly 8px consistently (taskbar is set to small icons).

![Alt](https://raw.githubusercontent.com/adi518/electron-frameless-maximize-test/master/issue.jpg)

### How to reproduce

https://github.com/adi518/electron-frameless-maximize-test
atom/browser/ui/win/atom_desktop_window_tree_host_win.cc
#include "atom/browser/ui/win/atom_desktop_window_tree_host_win.h"
#include "atom/browser/ui/win/message_handler_delegate.h"
namespace atom {
AtomDesktopWindowTreeHostWin::AtomDesktopWindowTreeHostWin(
    MessageHandlerDelegate* delegate,
    views::internal::NativeWidgetDelegate* native_widget_delegate,
    views::DesktopNativeWidgetAura* desktop_native_widget_aura)
        : views::DesktopWindowTreeHostWin(native_widget_delegate,
                                          desktop_native_widget_aura),
          delegate_(delegate) {
}
AtomDesktopWindowTreeHostWin::~AtomDesktopWindowTreeHostWin() {
}
bool AtomDesktopWindowTreeHostWin::PreHandleMSG(
    UINT message, WPARAM w_param, LPARAM l_param, LRESULT* result) {
  return delegate_->PreHandleMSG(message, w_param, l_param, result);
}
/** Override the client area inset
 *  Returning true forces a border of 0 for frameless windows
 */
bool AtomDesktopWindowTreeHostWin::GetClientAreaInsets(
    gfx::Insets* insets) const {
  return !HasFrame();
}
}