* 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 (forward && !forwarding_mouse_messages_) {
    forwarding_mouse_messages_ = true;
    forwarding_windows_.insert(this);
    
    
    SetWindowSubclass(legacy_window_, SubclassProc, 1,
                      reinterpret_cast<DWORD_PTR>(this));
    if (!mouse_hook_) {
      mouse_hook_ = SetWindowsHookEx(WH_MOUSE_LL, MouseHookProc, NULL, 0);
    }
  } else if (!forward && forwarding_mouse_messages_) {
    forwarding_mouse_messages_ = false;
    forwarding_windows_.erase(this);
    RemoveWindowSubclass(legacy_window_, SubclassProc, 1);
    if (forwarding_windows_.size() == 0) {
      UnhookWindowsHookEx(mouse_hook_);
      mouse_hook_ = NULL;
    }
  }
}
LRESULT CALLBACK NativeWindowViews::SubclassProc(HWND hwnd,