Fix for html select state not restored when app brought to foreground from background.
BUG=139760
TEST=As described in the bug.
When power button or home key is pressed, ChromeView's onActivityPause dismisses the SelectPopupDialog. But this is not known to native code.
Next time user clicks a select box, renderer(RenderViewImpl::createExternalPopupMenu) assumes the previously created external_popup_menu_ is still visible and doesn't show it again. Fix is to let the native code know that the popup menu is dismissed.
Original CL: https://chromiumcodereview.appspot.com/
10837075/
Review URL: https://chromiumcodereview.appspot.com/
11365008
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@166424 0039d316-1c4b-4281-b951-d872f2087c98