* 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
if (!::IsWindow(taskbar)) {
    APPBARDATA taskbar_data = {sizeof(APPBARDATA), 0, 0, 0};
    unsigned int taskbar_state = SHAppBarMessage(ABM_GETSTATE, &taskbar_data);
    if (!(taskbar_state & ABS_AUTOHIDE))
      return false;
    taskbar_data.hWnd = ::FindWindow(L"Shell_TrayWnd", NULL);
    if (!::IsWindow(taskbar_data.hWnd))
      return false;
    SHAppBarMessage(ABM_GETTASKBARPOS, &taskbar_data);
    if (taskbar_data.uEdge == edge)
      taskbar = taskbar_data.hWnd;
  }