Fix status bubble positioning with custom border widths by positioning the bu...

Fix status bubble positioning with custom border widths by positioning the bubble relative to the client area and then converting to parent coordinates instead of trying to position it absolutely with hardcoded constants.

Also changes an Offset() call to ConvertPointToView(), which is functionally the same but I think clearer in intent.

BUG=5054
TEST=In both Classic and Luna, use the Display control panel to set your active/inactive border widths to something nonstandard (try 20, that's real noticeable) and maximize a Chrome window. Make sure when hovering a link that the status bubble appears aligned with the screen corner instead of partly offscreen.

Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=8059

[sky, 2009-01-15 00:57:59]

LGTM

Don't forget your TEST= to help the testing folks.