Restore parent semantings for external tab container creation, and error check the HWND.
Restore parent semantings for external tab container creation, and error check the HWND.

BUG=none
TEST=none

Review URL: http://codereview.chromium.org/115852

git-svn-id: http://src.chromium.org/svn/trunk/src@17110 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: 656cf917a99f2ea533cebc4e50abc81c09d542aa
meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser