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Revert 113075 (requested by asvitkine) (requested by asvitkine) (requested by asvitkine) (requested by asvitkine) (requested by asvitkine) (requested by asvitkine) (requested by asvitkine) (requested by asvitkine) (requested by asvitkine) - Improve RenderTextWin font fallback.

Don't use SCRIPT_UNDEFINED in the case of font fallback,
unless font fallback actually fails to return a script
that can display the characters. This fixes the problem
of some scripts not being properly displayed.

This actually makes RenderTextWin properly validate whether
a text position accepts a cursor, which caused several tests
to fail and revealed some additional issues in RenderTextWin.

The CL includes some modifications to address this.

Some tests are disabled under XP, see:
http://crbug.com/106450

Also, fixes some lint warnings.

BUG=90426
TEST=Run chrome.exe --use-pure-views and paste some Bengali
text into the omnibox. It should show up properly.

Review URL: http://codereview.chromium.org/8575020

TBR=asvitkine@chromium.org
Review URL: http://codereview.chromium.org/8819001

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@113083 0039d316-1c4b-4281-b951-d872f2087c98