* Output of `node_modules/.bin/electron --version`: v3.0.10
* Operating System (Platform and Version): Windows 10 x64 (1803  17134.345)
* Output of `node_modules/.bin/electron --version` on last known working Electron version (if applicable):
v3.0.10
**Expected Behavior**
I would like to see the window move across the screen.

**Actual behavior**
The window moves around the screen. But first, the height of the window decreases.

**To Reproduce**
Write simple program that contains code:
`
mainWindow = new BrowserWindow({ width: 370,
		height: 270,
		x: 100,
		y: 100,
		resizable: false,
	 });
`
Start app. Grab the window with the mouse for its title and drag across the screen.

**Additional Information**
This error occurs when explicitly specifying the x, y coordinates of the window and the option "resizable: false".

atom/browser/native_window.cc
SetBackgroundColor(ParseHexColor(color));
  } else if (!transparent()) {
    
    SetBackgroundColor(SK_ColorWHITE);
  }
  std::string title(Browser::Get()->GetName());
  options.Get(options::kTitle, &title);
  SetTitle(title);
  
  bool show = true;
  options.Get(options::kShow, &show);
  if (show)
    Show();
}
bool NativeWindow::IsClosed() const {
  return is_closed_;
}
void NativeWindow::SetSize(const gfx::Size& size, bool animate) {
  SetBounds(gfx::Rect(GetPosition(), size), animate);
}
gfx::Size NativeWindow::GetSize() {
  return GetBounds().size();
}
void NativeWindow::SetPosition(const gfx::Point& position, bool animate) {
  SetBounds(gfx::Rect(position, GetSize()), animate);
}
gfx::Point NativeWindow::GetPosition() {
  return GetBounds().origin();
}
void NativeWindow::SetContentSize(const gfx::Size& size, bool animate) {