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Fixes crash on JS dialog popups from the extension bubbles.

Check for child HWND in WidgetFocusChangeListener::OnNativeFocusChange.
Code from BubbleWidget in browser_bubble_win.cc (crrev.com/112278)

See Issue 106958 for Aura, the dialog&bubble close early without crashing.

BUG=106723,106958
TEST=The js alert extension attached to the issue doesn't crash, popup works on non-aura.

Review URL: http://codereview.chromium.org/8879045

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@113936 0039d316-1c4b-4281-b951-d872f2087c98