Bug 1427608 - [css-grid] Fix span=1 'auto' min-sizing for intrinsic sizing. r=dholbert

When sizing the container under a min- or max-content constraint,
the item's min/max-content contribution needs to be clamped (when
Automatic Minimum Size / clamping applies) if its size is 'auto'.
That'll give the container the right intrinsic size. In Reflow,
we'll size the track initially to the clamped min-content
contribution again (in the Resolve Intrinsic Track Sizes step),
but since the container now has a definite size we'll grow
the track in the Maximize Tracks step up to its limit
(i.e. the clamp size).

For more details on the underlying issue, see:
w3c/csswg-drafts#2303

UltraBlame original commit: 82bd129fd8059961fca6eca013cf7ed84ccee897

Author: marco-c

layout/base/nsLayoutUtils.cpp

@@ -27098,35 +27098,6 @@ StyleBoxSizing
 :
 Content
 ;
-if
-(
-aMarginBoxMinSizeClamp
-!
-=
-NS_MAXSIZE
-&
-&
-styleISize
-.
-GetIntValue
-(
-)
-=
-=
-NS_STYLE_WIDTH_MIN_CONTENT
-)
-{
-result
-=
-aFrame
--
->
-GetMinISize
-(
-aRenderingContext
-)
-;
-}
 }
 else
 if
@@ -27165,19 +27136,6 @@ gNoiseIndent
 endif
 if
 (
-aType
-!
-=
-MIN_ISIZE
-)
-{
-aMarginBoxMinSizeClamp
-=
-NS_MAXSIZE
-;
-}
-if
-(
 MOZ_UNLIKELY
 (
 !