Revert 225776 "Perform the window activation code in WM_ACTIVATE..."

> Perform the window activation code in WM_ACTIVATE instead of WM_NCACTIVATE.
> 
> This ensures that we don't inadvarently mark a window as active when the code uses APIs like FlashWindow,
> which send periodic WM_NCACTIVATE messages to flash the caption.
> 
> BUG=297813
> TEST=Covered by ui test WidgetNotActivatedOnFakeActivationMessages
> R=sky@chromium.org
> 
> Review URL: https://codereview.chromium.org/24856002

TBR=ananta@chromium.org

Review URL: https://codereview.chromium.org/25014006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@225785 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 225785