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

Source/core/layout/line/RootInlineBox.cpp

 /*
  * Copyright (C) 2003, 2006, 2008 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.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 300 matching lines @@
         // Now fill in any gaps on the line that occurred between two selected elements.
         LayoutUnit lastLogicalLeft = firstBox->logicalRight();
         bool isPreviousBoxSelected = firstBox->selectionState() != SelectionNone;
         for (InlineBox* box = firstBox->nextLeafChild(); box; box = box->nextLeafChild()) {
             if (box->selectionState() != SelectionNone) {
                 LayoutRect logicalRect(lastLogicalLeft, selTop, box->logicalLeft() - lastLogicalLeft, selHeight);
                 logicalRect.move(lineLayoutItem().isHorizontalWritingMode() ? offsetFromRootBlock : LayoutSize(offsetFromRootBlock.height(), offsetFromRootBlock.width()));
                 LayoutRect gapRect = rootBlock->logicalRectToPhysicalRect(rootBlockPhysicalPosition, logicalRect);
                 if (isPreviousBoxSelected && gapRect.width() > 0 && gapRect.height() > 0) {
                     if (paintInfo && box->parent()->lineLayoutItem().style()->visibility() == VISIBLE)
-                        paintInfo->context->fillRect(gapRect, box->parent()->lineLayoutItem().selectionBackgroundColor());
+                        paintInfo->context->fillRect(FloatRect(gapRect), box->parent()->lineLayoutItem().selectionBackgroundColor());
                     // VisibleSelection may be non-contiguous, see comment above.
                     result.uniteCenter(gapRect);
                 }
                 lastLogicalLeft = box->logicalRight();
             }
             if (box == lastBox)
                 break;
             isPreviousBoxSelected = box->selectionState() != SelectionNone;
         }
     }
@@ skipping 516 matching lines @@
     endBox = nullptr;
     return nullptr;
 }
 
 const char* RootInlineBox::boxName() const
 {
     return "RootInlineBox";
 }
 
 } // namespace blink