Remove unnecessary LayoutUnit -> float -> LayoutUnit conversions.

Source/core/layout/line/InlineTextBox.cpp

 /*
  * (C) 1999 Lars Knoll (knoll@kde.org)
  * (C) 2000 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
@@ skipping 186 matching lines @@
 
     LayoutUnit selTop = root().selectionTop();
     LayoutUnit selHeight = root().selectionHeight();
     const ComputedStyle& styleToUse = layoutObject().styleRef(isFirstLineStyle());
     const Font& font = styleToUse.font();
 
     StringBuilder charactersWithHyphen;
     bool respectHyphen = ePos == m_len && hasHyphen();
     TextRun textRun = constructTextRun(styleToUse, font, respectHyphen ? &charactersWithHyphen : 0);
 
-    LayoutPoint startingPoint = LayoutPoint(logicalLeft(), selTop.toFloat());
+    LayoutPoint startingPoint = LayoutPoint(logicalLeft(), selTop);
     LayoutRect r;
     if (sPos || ePos != static_cast<int>(m_len)) {
         r = LayoutRect(enclosingIntRect(font.selectionRectForText(textRun, FloatPoint(startingPoint), selHeight, sPos, ePos)));
     } else { // Avoid computing the font width when the entire line box is selected as an optimization.
         // FIXME: the call to rawValue() below is temporary and should be removed once the transition
         // to LayoutUnit-based types is complete (crbug.com/321237)
-        r = LayoutRect(enclosingIntRect(LayoutRect(startingPoint, LayoutSize(m_logicalWidth, selHeight.toFloat()))));
+        r = LayoutRect(enclosingIntRect(LayoutRect(startingPoint, LayoutSize(m_logicalWidth, selHeight))));
     }
 
     LayoutUnit logicalWidth = r.width();
     if (r.x() > logicalRight())
         logicalWidth  = 0;
     else if (r.maxX() > logicalRight())
         logicalWidth = logicalRight() - r.x();
 
     LayoutPoint topPoint = isHorizontal() ? LayoutPoint(r.x(), selTop) : LayoutPoint(selTop, r.x());
     LayoutUnit width = isHorizontal() ? logicalWidth : selHeight;
@@ skipping 337 matching lines @@
     printedCharacters = fprintf(stderr, "\t%s %p", obj.name(), &obj);
     const int layoutObjectCharacterOffset = 75;
     for (; printedCharacters < layoutObjectCharacterOffset; printedCharacters++)
         fputc(' ', stderr);
     fprintf(stderr, "(%d,%d) \"%s\"\n", start(), start() + len(), value.utf8().data());
 }
 
 #endif
 
 } // namespace blink