Revert of Remove StringBuilder::appendLiteral.

third_party/WebKit/Source/wtf/text/StringBuilderTest.cpp

 /*
  * Copyright (C) 2011 Google Inc. All rights reserved.
  * Copyright (C) 2013 Apple 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.
@@ skipping 270 matching lines @@
         EXPECT_EQ(emptyAtom, atomicString);
     }
     { // AtomicString constructed from an empty char* string.
         StringBuilder builder;
         builder.append("", 0);
         AtomicString atomicString = builder.toAtomicString();
         EXPECT_EQ(emptyAtom, atomicString);
     }
     { // Cleared StringBuilder.
         StringBuilder builder;
-        builder.append("WebKit");
+        builder.appendLiteral("WebKit");
         builder.clear();
         AtomicString atomicString = builder.toAtomicString();
         EXPECT_EQ(emptyAtom, atomicString);
     }
 }
 
 TEST(StringBuilderTest, Substring)
 {
     { // Default constructed.
         StringBuilder builder;
@@ skipping 15 matching lines @@
     StringBuilder reference;
     reference.append(replacementCharacter); // Make it UTF-16.
     reference.append(String::number(someNumber));
     StringBuilder test;
     test.append(replacementCharacter);
     test.appendNumber(someNumber);
     EXPECT_EQ(reference, test);
 }
 
 } // namespace WTF