Merge 53471 - Fix regression that stopped properly restoring focus to tab con...

Merge 53471 - Fix regression that stopped properly restoring focus to tab contents.
The bug in r51262 was that native_tab_contents_container_win overrides
RequestFocus, so it can't be *reliably* focused just using SetFocus.

This is a simple, straightforward fix that should be merged for M6.

Afterwards, I think a better solution for the dev channel would be to get rid
of the hacky RequestFocus overrides and add a View::HasNativeFocus method
so that FocusManager can tell when it thinks a view already has focus, but the
native focus might need to be set again. Thoughts?

BUG=48917
BUG=49061
TEST=none

Review URL: http://codereview.chromium.org/3013023

TBR=dmazzoni@chromium.org


Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=53835