* 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
return sheet_offset_x_;
}
double NativeWindow::GetSheetOffsetY() {
  return sheet_offset_y_;
}
void NativeWindow::SetRepresentedFilename(const std::string& filename) {}
std::string NativeWindow::GetRepresentedFilename() {
  return "";
}
void NativeWindow::SetDocumentEdited(bool edited) {}
bool NativeWindow::IsDocumentEdited() {
  return false;
}
void NativeWindow::SetFocusable(bool focusable) {}
void NativeWindow::SetMenu(AtomMenuModel* menu) {}
void NativeWindow::SetParentWindow(NativeWindow* parent) {
  parent_ = parent;
}
void NativeWindow::SetAutoHideCursor(bool auto_hide) {}
void NativeWindow::SelectPreviousTab() {}
void NativeWindow::SelectNextTab() {}
void NativeWindow::MergeAllWindows() {}
void NativeWindow::MoveTabToNewWindow() {}
void NativeWindow::ToggleTabBar() {}
bool NativeWindow::AddTabbedWindow(NativeWindow* window) {
  return true;  
}
void NativeWindow::SetVibrancy(const std::string& filename) {}