Fix ODR violation that can break WTF::String pretty printing in tests.

Source/wtf/testing/WTFTestHelpersTest.cpp

-/*
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-
-#include "config.h"
-#include "wtf/testing/WTFTestHelpers.h"
-
-#include "wtf/StdLibExtras.h"
-#include "wtf/text/CString.h"
-#include "wtf/text/WTFString.h"
-#include <gtest/gtest.h>
-#include <sstream>
-#include <string>
-
-using namespace WTF;
-
-namespace {
-
-CString toCStringThroughPrinter(const String& string)
-{
-    std::ostringstream output;
-    output << string;
-    const std::string& result = output.str();
-    return CString(result.data(), result.length());
-}
-
-TEST(WTFTestHelpersTest, StringPrinter)
-{
-    EXPECT_EQ(CString("\"Hello!\""), toCStringThroughPrinter("Hello!"));
-    EXPECT_EQ(CString("\"\\\"\""), toCStringThroughPrinter("\""));
-    EXPECT_EQ(CString("\"\\\\\""), toCStringThroughPrinter("\\"));
-    EXPECT_EQ(CString("\"\\u0000\\u0001\\u0002\\u0003\\u0004\\u0005\\u0006\\u0007\""), toCStringThroughPrinter(String("\x00\x01\x02\x03\x04\x05\x06\x07", 8)));
-    EXPECT_EQ(CString("\"\\u0008\\t\\n\\u000B\\u000C\\r\\u000E\\u000F\""), toCStringThroughPrinter(String("\x08\x09\x0A\x0B\x0C\x0D\x0E\x0F", 8)));
-    EXPECT_EQ(CString("\"\\u0010\\u0011\\u0012\\u0013\\u0014\\u0015\\u0016\\u0017\""), toCStringThroughPrinter(String("\x10\x11\x12\x13\x14\x15\x16\x17", 8)));
-    EXPECT_EQ(CString("\"\\u0018\\u0019\\u001A\\u001B\\u001C\\u001D\\u001E\\u001F\""), toCStringThroughPrinter(String("\x18\x19\x1A\x1B\x1C\x1D\x1E\x1F", 8)));
-    EXPECT_EQ(CString("\"\\u007F\\u0080\\u0081\""), toCStringThroughPrinter("\x7F\x80\x81"));
-    EXPECT_EQ(CString("\"\""), toCStringThroughPrinter(emptyString()));
-    EXPECT_EQ(CString("<null>"), toCStringThroughPrinter(String()));
-
-    static const UChar unicodeSample[] = { 0x30C6, 0x30B9, 0x30C8 }; // "Test" in Japanese.
-    EXPECT_EQ(CString("\"\\u30C6\\u30B9\\u30C8\""), toCStringThroughPrinter(String(unicodeSample, WTF_ARRAY_LENGTH(unicodeSample))));
-
-}
-
-}