Migrate WTF::Vector::append() to ::push_back() [part 12 of N]

third_party/WebKit/Source/core/paint/GridPainter.cpp

Index: third_party/WebKit/Source/core/paint/GridPainter.cpp
diff --git a/third_party/WebKit/Source/core/paint/GridPainter.cpp b/third_party/WebKit/Source/core/paint/GridPainter.cpp
index 2df637c9cbb9e5ed561cd544226f97e759339a33..fb57d1d3b34f9a4cbcbce83b75f0fc9347632d03 100644
--- a/third_party/WebKit/Source/core/paint/GridPainter.cpp
+++ b/third_party/WebKit/Source/core/paint/GridPainter.cpp
@@ -84,14 +84,14 @@ void GridPainter::paintChildren(const PaintInfo& paintInfo,
       const Vector<LayoutBox*, 1>& children =
           m_layoutGrid.gridCell(row, column);
       for (auto* child : children)
-        gridItemsToBePainted.append(
+        gridItemsToBePainted.push_back(
             std::make_pair(child, m_layoutGrid.paintIndexForGridItem(child)));
     }
   }
 
   for (auto* item : m_layoutGrid.itemsOverflowingGridArea()) {
     if (item->frameRect().intersects(localVisualRect))
-      gridItemsToBePainted.append(
+      gridItemsToBePainted.push_back(
           std::make_pair(item, m_layoutGrid.paintIndexForGridItem(item)));
   }