Get rid of redundant parameter PositionIsOffsetInAnchor from PositionAlgorithm constructor

Source/core/editing/VisibleUnitsTest.cpp

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "config.h"
 #include "core/editing/VisibleUnits.h"
 
 #include "core/editing/EditingTestBase.h"
 #include "core/editing/VisiblePosition.h"
 
 namespace blink {
 
 namespace {
 
 PositionWithAffinity positionWithAffinityInDOMTree(Node& anchor, int offset, EAffinity affinity = DOWNSTREAM)
 {
-    return PositionWithAffinity(canonicalPositionOf(Position(&anchor, offset, Position::PositionIsOffsetInAnchor)), affinity);
+    return PositionWithAffinity(canonicalPositionOf(Position(&anchor, offset)), affinity);
 }
 
 PositionInComposedTreeWithAffinity positionWithAffinityInComposedTree(Node& anchor, int offset, EAffinity affinity = DOWNSTREAM)
 {
-    return PositionInComposedTreeWithAffinity(canonicalPositionOf(PositionInComposedTree(&anchor, offset, PositionInComposedTree::PositionIsOffsetInAnchor)), affinity);
+    return PositionInComposedTreeWithAffinity(canonicalPositionOf(PositionInComposedTree(&anchor, offset)), affinity);
 }
 
 } // namespace
 
 class VisibleUnitsTest : public EditingTestBase {
 };
 
 TEST_F(VisibleUnitsTest, inSameLine)
 {
     const char* bodyContent = "<p id='host'>00<b id='one'>11</b><b id='two'>22</b>33</p>";
@@ skipping 13 matching lines @@
     EXPECT_FALSE(inSameLine(positionWithAffinityInDOMTree(*one->firstChild(), 0), positionWithAffinityInDOMTree(*five->firstChild(), 0)));
     EXPECT_FALSE(inSameLine(positionWithAffinityInDOMTree(*two->firstChild(), 0), positionWithAffinityInDOMTree(*four->firstChild(), 0)));
 
     EXPECT_FALSE(inSameLine(positionWithAffinityInComposedTree(*one, 0), positionWithAffinityInComposedTree(*two, 0)));
     EXPECT_FALSE(inSameLine(positionWithAffinityInComposedTree(*one->firstChild(), 0), positionWithAffinityInComposedTree(*two->firstChild(), 0)));
     EXPECT_FALSE(inSameLine(positionWithAffinityInComposedTree(*one->firstChild(), 0), positionWithAffinityInComposedTree(*five->firstChild(), 0)));
     EXPECT_TRUE(inSameLine(positionWithAffinityInComposedTree(*two->firstChild(), 0), positionWithAffinityInComposedTree(*four->firstChild(), 0)));
 }
 
 } // namespace blink