Convert some call sites to use explicit LayoutRect->FloatRect conversion.

Source/core/layout/line/AbstractInlineTextBox.cpp

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 81 matching lines @@
         return nullptr;
 
     return getOrCreate(m_layoutText, m_inlineTextBox->nextTextBox());
 }
 
 LayoutRect AbstractInlineTextBox::bounds() const
 {
     if (!m_inlineTextBox || !m_layoutText)
         return LayoutRect();
 
-    FloatRect boundaries = m_inlineTextBox->calculateBoundaries();
+    FloatRect boundaries(m_inlineTextBox->calculateBoundaries());
     return LayoutRect(m_layoutText->localToAbsoluteQuad(boundaries).enclosingBoundingBox());
 }
 
 unsigned AbstractInlineTextBox::len() const
 {
     if (!m_inlineTextBox)
         return 0;
 
     return m_inlineTextBox->len();
 }
@@ skipping 89 matching lines @@
         return nullptr;
 
     InlineBox* previous = m_inlineTextBox->prevOnLine();
     if (previous && previous->isInlineTextBox())
         return getOrCreate(&toInlineTextBox(previous)->layoutObject(), toInlineTextBox(previous));
 
     return nullptr;
 }
 
 } // namespace blink