Move Node::lengthOfContents into Range, its only user.

third_party/WebKit/Source/core/dom/AttrTest.cpp

Index: third_party/WebKit/Source/core/dom/AttrTest.cpp
diff --git a/third_party/WebKit/Source/core/dom/AttrTest.cpp b/third_party/WebKit/Source/core/dom/AttrTest.cpp
index 03b115a6082a34ff59ef21b67446dab7ceb5c723..e658e2d625679a1ff71d279f728b4260db32dd23 100644
--- a/third_party/WebKit/Source/core/dom/AttrTest.cpp
+++ b/third_party/WebKit/Source/core/dom/AttrTest.cpp
@@ -62,11 +62,4 @@ TEST_F(AttrTest, SetTextContent) {
   EXPECT_EQ(value(), attr->textContent());
 }
 
-TEST_F(AttrTest, LengthOfContents) {
-  Attr* attr = createAttribute();
-  EXPECT_EQ(0u, attr->lengthOfContents());
-  attr->setValue(value());
-  EXPECT_EQ(0u, attr->lengthOfContents());
-}
-
 }  // namespace blink