* 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
SetSize(ContentBoundsToWindowBounds(gfx::Rect(size)).size(), animate);
}
gfx::Size NativeWindow::GetContentSize() {
  return GetContentBounds().size();
}
void NativeWindow::SetContentBounds(const gfx::Rect& bounds, bool animate) {
  SetBounds(ContentBoundsToWindowBounds(bounds), animate);
}
gfx::Rect NativeWindow::GetContentBounds() {
  return WindowBoundsToContentBounds(GetBounds());
}
bool NativeWindow::IsNormal() {
  return !IsMinimized() && !IsMaximized() && !IsFullscreen();
}
void NativeWindow::SetSizeConstraints(
    const extensions::SizeConstraints& window_constraints) {
  extensions::SizeConstraints content_constraints(GetContentSizeConstraints());
  if (window_constraints.HasMaximumSize()) {
    gfx::Rect max_bounds = WindowBoundsToContentBounds(
        gfx::Rect(window_constraints.GetMaximumSize()));
    content_constraints.set_maximum_size(max_bounds.size());
  }
  if (window_constraints.HasMinimumSize()) {
    gfx::Rect min_bounds = WindowBoundsToContentBounds(
        gfx::Rect(window_constraints.GetMinimumSize()));
    content_constraints.set_minimum_size(min_bounds.size());
  }
  SetContentSizeConstraints(content_constraints);
}
extensions::SizeConstraints NativeWindow::GetSizeConstraints() const {