Replace WTF::emptyString{16Bit}() with a static global

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 268 matching lines @@
     EXPECT_EQ(emptyAtom, atomicString);
   }
   {  // AtomicString constructed from a null string.
     StringBuilder builder;
     builder.append(String());
     AtomicString atomicString = builder.toAtomicString();
     EXPECT_EQ(emptyAtom, atomicString);
   }
   {  // AtomicString constructed from an empty string.
     StringBuilder builder;
-    builder.append(emptyString());
+    builder.append(emptyString);
     AtomicString atomicString = builder.toAtomicString();
     EXPECT_EQ(emptyAtom, atomicString);
   }
   {  // AtomicString constructed from an empty StringBuilder.
     StringBuilder builder;
     StringBuilder emptyBuilder;
     builder.append(emptyBuilder);
     AtomicString atomicString = builder.toAtomicString();
     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.clear();
     AtomicString atomicString = builder.toAtomicString();
     EXPECT_EQ(emptyAtom, atomicString);
   }
 }
 
 TEST(StringBuilderTest, Substring) {
   {  // Default constructed.
     StringBuilder builder;
     String substring = builder.substring(0, 10);
-    EXPECT_EQ(emptyString(), substring);
+    EXPECT_EQ(emptyString, substring);
   }
   {  // With capacity.
     StringBuilder builder;
     builder.reserveCapacity(64);
     builder.append("abc");
     String substring = builder.substring(2, 10);
     EXPECT_EQ(String("c"), substring);
   }
 }
 
 TEST(StringBuilderTest, AppendNumberDoubleUChar) {
   const double someNumber = 1.2345;
   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