* Electron Version: 2.0.0
* Operating System (Platform and Version): Windows 10
* Last known working Electron version: before commit bb5eecc16cff8053c7b04e0b9396803fbbb8c4df

**Expected Behavior**
Width and height of a window should not change while being dragged 

**Actual behavior**
Width and height become smaller.

**To Reproduce**
Create a window with:
  var mainWindow = new BrowserWindow({width: 1024, height: 880, x: 30, y: 30,
            resizable: false })

Then drag the window.  Width and height become smaller than specified (1024, 880)

**Additional Information**
NativeWindowViews::SetBounds calls SetMin/MaxSize(bounds) when resizable_ is false.  bounds get adjusted to smaller  numbers by WindowBoundsToContentBounds.

shell/browser/native_window_views_win.cc
switch (w_param) {
    case SIZE_MAXIMIZED: {
      last_window_state_ = ui::SHOW_STATE_MAXIMIZED;
      if (consecutive_moves_) {
        last_normal_bounds_ = last_normal_bounds_before_move_;
      }
      if (!has_frame()) {
        TriggerNCCalcSize(GetAcceleratedWidget());
      }
      NotifyWindowMaximize();
      break;
    }
    case SIZE_MINIMIZED:
      last_window_state_ = ui::SHOW_STATE_MINIMIZED;
      WINDOWPLACEMENT wp;
      wp.length = sizeof(WINDOWPLACEMENT);
      if (GetWindowPlacement(GetAcceleratedWidget(), &wp)) {
        last_normal_placement_bounds_ = gfx::Rect(wp.rcNormalPosition);
      }
      NotifyWindowMinimize();
      break;
    case SIZE_RESTORED:
      if (last_window_state_ == ui::SHOW_STATE_NORMAL) {
        
        last_normal_bounds_ = GetBounds();
        last_normal_bounds_before_move_ = last_normal_bounds_;
      } else {