Revert 114083 - Convert app_launch_index and page_index from int to StringOrdinal.

Revert 114083 - Convert app_launch_index and page_index from int to StringOrdinal.

This application icon index values are being changed from ints to StringOrdinals to decrease the potential number of syncs required when icons are moved, by only needing to change 1 StringOrdinal instead of all the integers.


BUG=61447
TEST=Open up an instance of chromium with multiple application icons and ensure
that icons can still have their page and order changed. There should be no
behaviour change.


Review URL: http://codereview.chromium.org/8198003

TBR=csharp@chromium.org
Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=114257