Call SetWindowPos when RWHVWin is hidden

This makes RenderWidgetHostViewWin::SetBounds() call ::SetWindowPos even
when it thinks the view is hidden. The canonical view size for RWHVWin is
stored on the HWND, so we have to set it here in or we'll completely forget
the new size.

Prior to r229428, RenderWidgetHostViewWin stored its own is_hidden_ bit which
was incorrectly false when opening a tab in the background so we'd call
::SetWindowPos() in this path anyway.

BUG=310460
R=sky@chromium.org

Review URL: https://codereview.chromium.org/38363002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@230523 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 230523
Add ScopedPK11SlotList to scoped_nss_types.h

BUG=none

Review URL: https://codereview.chromium.org/33003004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@230524 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 230524