Get rid of redundant member function PositionAlgorithm<Strategy>::{upstream,downstream}

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"
 
@@ skipping 34 matching lines @@
     EXPECT_TRUE(inSameLine(positionWithAffinityInDOMTree(*one->firstChild(), 0), positionWithAffinityInDOMTree(*two->firstChild(), 0)));
     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)));
 }
 
+TEST_F(VisibleUnitsTest, mostBackwardCaretPositionAfterAnchor)
+{
+    const char* bodyContent = "<p id='host'><b id='one'>1</b></p><b id='two'>22</b>";
+    const char* shadowContent = "<b id='two'>22</b><content select=#one></content><b id='three'>333</b>";
+    setBodyContent(bodyContent);
+    setShadowContent(shadowContent);
+    updateLayoutAndStyleForPainting();
+
+    RefPtrWillBeRawPtr<Element> host = document().getElementById("host");
+
+    EXPECT_EQ(Position::lastPositionInNode(host.get()), mostForwardCaretPosition(Position::afterNode(host.get())));
+    EXPECT_EQ(PositionInComposedTree::lastPositionInNode(host.get()), mostForwardCaretPosition(PositionInComposedTree::afterNode(host.get())));
+}
+
+TEST_F(VisibleUnitsTest, mostForwardCaretPositionAfterAnchor)
+{
+    const char* bodyContent = "<p id='host'><b id='one'>1</b></p>";
+    const char* shadowContent = "<b id='two'>22</b><content select=#one></content><b id='three'>333</b>";
+    setBodyContent(bodyContent);
+    RefPtrWillBeRawPtr<ShadowRoot> shadowRoot = setShadowContent(shadowContent);
+    updateLayoutAndStyleForPainting();
+
+    RefPtrWillBeRawPtr<Element> host = document().getElementById("host");
+    RefPtrWillBeRawPtr<Element> one = document().getElementById("one");
+    RefPtrWillBeRawPtr<Element> three = shadowRoot->getElementById("three");
+
+    EXPECT_EQ(Position(one->firstChild(), 1), mostBackwardCaretPosition(Position::afterNode(host.get())));
+    EXPECT_EQ(PositionInComposedTree(three->firstChild(), 3), mostBackwardCaretPosition(PositionInComposedTree::afterNode(host.get())));
+}
+
 TEST_F(VisibleUnitsTest, rendersInDifferentPositionAfterAnchor)
 {
     const char* bodyContent = "<p id='sample'>00</p>";
     setBodyContent(bodyContent);
     updateLayoutAndStyleForPainting();
     RefPtrWillBeRawPtr<Element> sample = document().getElementById("sample");
 
     EXPECT_FALSE(rendersInDifferentPosition(Position::afterNode(sample.get()), Position(sample.get(), 1)));
     EXPECT_FALSE(rendersInDifferentPosition(Position::lastPositionInNode(sample.get()), Position(sample.get(), 1)));
 }
 
 TEST_F(VisibleUnitsTest, renderedOffset)
 {
     const char* bodyContent = "<div contenteditable><span id='sample1'>1</span><span id='sample2'>22</span></div>";
     setBodyContent(bodyContent);
     updateLayoutAndStyleForPainting();
     RefPtrWillBeRawPtr<Element> sample1 = document().getElementById("sample1");
     RefPtrWillBeRawPtr<Element> sample2 = document().getElementById("sample2");
 
     EXPECT_FALSE(rendersInDifferentPosition(Position::afterNode(sample1->firstChild()), Position(sample2->firstChild(), 0)));
     EXPECT_FALSE(rendersInDifferentPosition(Position::lastPositionInNode(sample1->firstChild()), Position(sample2->firstChild(), 0)));
 }
 
 } // namespace blink