Limit visibility {Left,Right}BoundaryOfLine() to SelectionModifier only

third_party/WebKit/Source/core/editing/VisibleUnits.cpp

 /*
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009 Apple 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 1922 matching lines @@
   if (next_position.IsNull())
     return true;
   // In DOM version, following condition, the last position of inner editor
   // of INPUT/TEXTAREA element, by |nextPosition().isNull()|, because of
   // an inner editor is an only leaf node.
   if (!next_position.DeepEquivalent().IsAfterAnchor())
     return false;
   return IsTextControlElement(next_position.DeepEquivalent().AnchorNode());
 }
 
-VisiblePosition LeftBoundaryOfLine(const VisiblePosition& c,
-                                   TextDirection direction) {
-  DCHECK(c.IsValid()) << c;
-  return direction == TextDirection::kLtr ? LogicalStartOfLine(c)
-                                          : LogicalEndOfLine(c);
-}
-
-VisiblePosition RightBoundaryOfLine(const VisiblePosition& c,
-                                    TextDirection direction) {
-  DCHECK(c.IsValid()) << c;
-  return direction == TextDirection::kLtr ? LogicalEndOfLine(c)
-                                          : LogicalStartOfLine(c);
-}
-
 static bool IsNonTextLeafChild(LayoutObject* object) {
   if (object->SlowFirstChild())
     return false;
   if (object->IsText())
     return false;
   return true;
 }
 
 static InlineTextBox* SearchAheadForBetterMatch(LayoutObject* layout_object) {
   LayoutBlock* container = layout_object->ContainingBlock();
@@ skipping 1803 matching lines @@
 
 IntRect ComputeTextRect(const EphemeralRangeInFlatTree& range) {
   return EnclosingIntRect(ComputeTextRectTemplate(range));
 }
 
 FloatRect ComputeTextFloatRect(const EphemeralRange& range) {
   return ComputeTextRectTemplate(range);
 }
 
 }  // namespace blink