Remove FIXME re: negative maxHeight.

Source/core/layout/line/RootInlineBox.cpp

Index: Source/core/layout/line/RootInlineBox.cpp
diff --git a/Source/core/layout/line/RootInlineBox.cpp b/Source/core/layout/line/RootInlineBox.cpp
index 71fe8aad86a3ee685dd2b4cec5ea6e67ee814af7..613922a46a56796dd460e69209405555ec8e0de4 100644
--- a/Source/core/layout/line/RootInlineBox.cpp
+++ b/Source/core/layout/line/RootInlineBox.cpp
@@ -63,7 +63,6 @@ RootInlineBox::RootInlineBox(LayoutBlockFlow& block)
     setIsHorizontal(block.isHorizontalWritingMode());
 }
 
-
 void RootInlineBox::destroy()
 {
     detachEllipsisBox();
@@ -228,7 +227,7 @@ LayoutUnit RootInlineBox::alignBoxesInBlockDirection(LayoutUnit heightOfBlock, G
     m_hasAnnotationsBefore = hasAnnotationsBefore;
     m_hasAnnotationsAfter = hasAnnotationsAfter;
 
-    maxHeight = std::max<LayoutUnit>(0, maxHeight); // FIXME: Is this really necessary?
+    maxHeight = std::max<LayoutUnit>(0, maxHeight);
 
     setLineTopBottomPositions(lineTop, lineBottom, heightOfBlock, heightOfBlock + maxHeight, selectionBottom);