Relanding focus manager refactoring

This CL removes the last (major) Windows specific part out of the focus manager. 
It was previously landed and reverted because it broke the reliability tests.
http://codereview.chromium.org/125148

The breakage was caused by constrained windows not getting a hold of the FocusManager when in unparented tabs.
The fix is to ensure unparented tab still have a way to access their FocusManager for proper closure.
Files changed from the previous patch that need reviewing:
native_tab_contents_container_win.cc
tab_contents_view_win.h
tab_contents_view_win.cc

BUG=None
TEST=Run all tests (unit, ui, interactive). Extensively test the focus in Chrome.




Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=19617

[Ben Goodger (Google), 2009-06-26 21:18:08]

OK

http://codereview.chromium.org/146093/diff/1319/2048
File chrome/browser/views/tab_contents/tab_contents_view_win.h (right):

http://codereview.chromium.org/146093/diff/1319/2048#newcode31
Line 31: virtual void Unparent();
doesn't need to be virtual