Revert 268933 "Helpful message for not checking SupportsMultiple..."

Revert 268933 "Helpful message for not checking SupportsMultiple..."

Speculative revert to see if this fixes massive test failures on win bot.

> Helpful message for not checking SupportsMultipleDisplays on Win7 tests.
> 
> "Multiple display test does not work on Windows bots. Please skip (don't
> disable) the test using SupportsMultipleDisplays()"
> 
> Previously, this message only showed on Windows 8 if you forget to check
> SupportsMultipleDisplays in a test with multiple displays. Now it shows
> on Windows 7 as well.
> 
> Without this message, you get a much more confusing crash.
> 
> BUG=370796
> 
> Review URL: https://codereview.chromium.org/270253003

TBR=mgiuca@chromium.org

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=269081

[oshima, 2014-05-08 20:18:18]

Committed patchset #1 manually as r269081 (tree was closed).