Drop down list boxes stopped showing up on Canary builds on Windows Desktop Aura recently.

This regressed in this revision r243590 (https://codereview.chromium.org/118283003). Reason being we changed
HWNDMessageHandler::Show to always use the SHOW_STATE_NORMAL flag which shows the window and also grabs activation.
Activation changes cause the main window to lose activation which collapses the combo box window. In any case the
window created for the combo boxes specifies the no_activate flag in the Widget params which we are not honoring here.

Fix is to show the window as inactive if it has the WS_EX_NOACTIVATE or WS_EX_TRANSPARENT extended styles.

BUG=333207
TEST=Covered by views test InactiveWidgetDoesNotGrabActivation
R=sky@chromium.org

Review URL: https://codereview.chromium.org/133213003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@244605 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 244605