Get rid of findPlainText() with Range parameter

Source/core/editing/iterators/TextIteratorTest.cpp

 /*
  * Copyright (c) 2013, Google 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 372 matching lines @@
     };
     // A trailing surrogate followed by a lead surrogate (U+DC03 U+D901).
     static const UChar invalid3[] = {
         0xd800u, 0xdc00u, 0x0061u, 0xdc03u, 0xd901u, 0xccadu, 0
     };
 
     static const UChar* invalidUStrings[] = { invalid1, invalid2, invalid3 };
 
     for (size_t i = 0; i < WTF_ARRAY_LENGTH(invalidUStrings); ++i) {
         String invalidTarget(invalidUStrings[i]);
-        RefPtrWillBeRawPtr<Range> actualRange = findPlainText(range.get(), invalidTarget, 0);
+        Position foundStart;
+        Position foundEnd;
+        findPlainText(range->startPosition(), range->endPosition(), invalidTarget, 0, foundStart, foundEnd);
+        RefPtrWillBeRawPtr<Range> actualRange = Range::create(document(), foundStart, foundEnd);
         EXPECT_TRUE(areRangesEqual(expectedRange.get(), actualRange.get()));
     }
 }
 
 TEST_F(TextIteratorTest, EmitsReplacementCharForInput)
 {
     static const char* bodyContent =
         "<div contenteditable='true'>"
         "Before"
         "<img src='foo.png'>"
@@ skipping 26 matching lines @@
 
     Node* divNode = document().getElementById("div");
     RefPtrWillBeRawPtr<Range> entireRange = Range::create(document(), divNode, 0, divNode, 3);
 
     RefPtrWillBeRawPtr<Range> subrange = TextIterator::subrange(entireRange.get(), 2, 3);
     EXPECT_EQ(0, subrange->startOffset());
     EXPECT_EQ(3, subrange->endOffset());
 }
 
 } // namespace blink