Introduce firstRangeOf() as replacement of VisibleSelection::firstRange()

Source/core/editing/SurroundingTextTest.cpp

 // Copyright 2014 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/SurroundingText.h"
 
 #include "core/dom/Document.h"
 #include "core/dom/Range.h"
 #include "core/dom/Text.h"
@@ skipping 98 matching lines @@
         EXPECT_EQ(7u, surroundingText.endOffsetInContent());
     }
 }
 
 TEST_F(SurroundingTextTest, BasicRangeSelection)
 {
     setHTML(String("<p id='selection'>Lorem ipsum dolor sit amet</p>"));
 
     {
         VisibleSelection selection = select(0, 5);
-        SurroundingText surroundingText(*selection.firstRange(), 1);
+        SurroundingText surroundingText(*firstRangeOf(selection), 1);
 
         EXPECT_EQ("Lorem ", surroundingText.content());
         EXPECT_EQ(0u, surroundingText.startOffsetInContent());
         EXPECT_EQ(5u, surroundingText.endOffsetInContent());
     }
 
     {
         VisibleSelection selection = select(0, 5);
-        SurroundingText surroundingText(*selection.firstRange(), 5);
+        SurroundingText surroundingText(*firstRangeOf(selection), 5);
 
         EXPECT_EQ("Lorem ip", surroundingText.content().simplifyWhiteSpace());
         EXPECT_EQ(1u, surroundingText.startOffsetInContent());
         EXPECT_EQ(6u, surroundingText.endOffsetInContent());
     }
 
     {
         VisibleSelection selection = select(0, 5);
-        SurroundingText surroundingText(*selection.firstRange(), 42);
+        SurroundingText surroundingText(*firstRangeOf(selection), 42);
 
         EXPECT_EQ("Lorem ipsum dolor sit amet", surroundingText.content().simplifyWhiteSpace());
         EXPECT_EQ(1u, surroundingText.startOffsetInContent());
         EXPECT_EQ(6u, surroundingText.endOffsetInContent());
     }
 
     {
         VisibleSelection selection = select(6, 11);
-        SurroundingText surroundingText(*selection.firstRange(), 2);
+        SurroundingText surroundingText(*firstRangeOf(selection), 2);
 
         EXPECT_EQ(" ipsum ", surroundingText.content());
         EXPECT_EQ(1u, surroundingText.startOffsetInContent());
         EXPECT_EQ(6u, surroundingText.endOffsetInContent());
     }
 
     {
         VisibleSelection selection = select(6, 11);
-        SurroundingText surroundingText(*selection.firstRange(), 42);
+        SurroundingText surroundingText(*firstRangeOf(selection), 42);
 
         EXPECT_EQ("Lorem ipsum dolor sit amet", surroundingText.content().simplifyWhiteSpace());
         EXPECT_EQ(7u, surroundingText.startOffsetInContent());
         EXPECT_EQ(12u, surroundingText.endOffsetInContent());
     }
 }
 
 TEST_F(SurroundingTextTest, TreeCaretSelection)
 {
     setHTML(String("<div>This is outside of <p id='selection'>foo bar</p> the selected node</div>"));
@@ skipping 43 matching lines @@
         EXPECT_EQ(26u, surroundingText.endOffsetInContent());
     }
 }
 
 TEST_F(SurroundingTextTest, TreeRangeSelection)
 {
     setHTML(String("<div>This is outside of <p id='selection'>foo bar</p> the selected node</div>"));
 
     {
         VisibleSelection selection = select(0, 1);
-        SurroundingText surroundingText(*selection.firstRange(), 1);
+        SurroundingText surroundingText(*firstRangeOf(selection), 1);
 
         EXPECT_EQ("fo", surroundingText.content().simplifyWhiteSpace());
         EXPECT_EQ(0u, surroundingText.startOffsetInContent());
         EXPECT_EQ(1u, surroundingText.endOffsetInContent());
     }
 
     {
         VisibleSelection selection = select(0, 3);
-        SurroundingText surroundingText(*selection.firstRange(), 12);
+        SurroundingText surroundingText(*firstRangeOf(selection), 12);
 
         EXPECT_EQ("e of foo bar", surroundingText.content().simplifyWhiteSpace());
         EXPECT_EQ(5u, surroundingText.startOffsetInContent());
         EXPECT_EQ(8u, surroundingText.endOffsetInContent());
     }
 
     {
         VisibleSelection selection = select(0, 3);
-        SurroundingText surroundingText(*selection.firstRange(), 1337);
+        SurroundingText surroundingText(*firstRangeOf(selection), 1337);
 
         EXPECT_EQ("This is outside of foo bar the selected node", surroundingText.content().simplifyWhiteSpace());
         EXPECT_EQ(20u, surroundingText.startOffsetInContent());
         EXPECT_EQ(23u, surroundingText.endOffsetInContent());
     }
 
     {
         VisibleSelection selection = select(4, 7);
-        SurroundingText surroundingText(*selection.firstRange(), 12);
+        SurroundingText surroundingText(*firstRangeOf(selection), 12);
 
         EXPECT_EQ("foo bar the se", surroundingText.content().simplifyWhiteSpace());
         EXPECT_EQ(5u, surroundingText.startOffsetInContent());
         EXPECT_EQ(8u, surroundingText.endOffsetInContent());
     }
 
     {
         VisibleSelection selection = select(0, 7);
-        SurroundingText surroundingText(*selection.firstRange(), 1337);
+        SurroundingText surroundingText(*firstRangeOf(selection), 1337);
 
         EXPECT_EQ("This is outside of foo bar the selected node", surroundingText.content().simplifyWhiteSpace());
         EXPECT_EQ(20u, surroundingText.startOffsetInContent());
         EXPECT_EQ(27u, surroundingText.endOffsetInContent());
     }
 }
 
 } // namespace blink