[css-grid] Fix wrong type in GridPositionsResolver method

third_party/WebKit/Source/core/style/GridPositionsResolver.cpp

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "GridPositionsResolver.h"
 
 #include "core/layout/LayoutBox.h"
 #include "core/style/GridArea.h"
 #include <algorithm>
 
@@ skipping 132 matching lines @@
     // Negative positions are not allowed per the specification and should have been handled during parsing.
     ASSERT(position.spanPosition() > 0);
 
     const NamedGridLinesMap& gridLinesNames = gridLinesForSide(gridContainerStyle, side);
     NamedGridLinesMap::const_iterator it = gridLinesNames.find(position.namedGridLine());
     const Vector<size_t>* gridLines = it == gridLinesNames.end() ? nullptr : &it->value;
     size_t lastLine = explicitGridSizeForSide(gridContainerStyle, side);
     return definiteGridSpanWithNamedSpanAgainstOpposite(oppositeLine, position, side, gridLines, lastLine);
 }
 
-static GridSpan definiteGridSpanWithSpanAgainstOpposite(size_t oppositeLine, const GridPosition& position, GridPositionSide side)
+static GridSpan definiteGridSpanWithSpanAgainstOpposite(int oppositeLine, const GridPosition& position, GridPositionSide side)
 {
     size_t positionOffset = position.spanPosition();
     if (side == ColumnStartSide || side == RowStartSide)
         return GridSpan::untranslatedDefiniteGridSpan(oppositeLine - positionOffset, oppositeLine);
 
     return GridSpan::untranslatedDefiniteGridSpan(oppositeLine, oppositeLine + positionOffset);
 }
 
 static GridSpan resolveGridPositionAgainstOppositePosition(const ComputedStyle& gridContainerStyle, int oppositeLine, const GridPosition& position, GridPositionSide side)
 {
@@ skipping 127 matching lines @@
 
     if (endLine < startLine)
         std::swap(endLine, startLine);
     else if (endLine == startLine)
         endLine = startLine + 1;
 
     return GridSpan::untranslatedDefiniteGridSpan(startLine, endLine);
 }
 
 } // namespace blink