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

Source/wtf/testing/WTFTestHelpers.cpp

Index: Source/wtf/testing/WTFTestHelpers.cpp
diff --git a/Source/wtf/testing/WTFTestHelpers.cpp b/Source/wtf/testing/WTFTestHelpers.cpp
deleted file mode 100644
index 84114a1b80ab48cff18f48d854b8104176166908..0000000000000000000000000000000000000000
--- a/Source/wtf/testing/WTFTestHelpers.cpp
+++ /dev/null
@@ -1,83 +0,0 @@
-/*
- * 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
- * copyright notice, this list of conditions and the following disclaimer
- * in the documentation and/or other materials provided with the
- * distribution.
- *     * Neither the name of Google Inc. nor the names of its
- * contributors may be used to endorse or promote products derived from
- * this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
- * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
- * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
- * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
- * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
- * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
-#include "config.h"
-#include "wtf/testing/WTFTestHelpers.h"
-
-#include "wtf/text/WTFString.h"
-#include <ios> // NOLINT
-#include <ostream> // NOLINT
-
-namespace WTF {
-
-std::ostream& operator<<(std::ostream& out, const String& string)
-{
-    if (string.isNull())
-        return out << "<null>";
-
-    out << '"';
-    for (unsigned index = 0; index < string.length(); ++index) {
-        // Print shorthands for select cases.
-        UChar character = string[index];
-        switch (character) {
-        case '\t':
-            out << "\\t";
-            break;
-        case '\n':
-            out << "\\n";
-            break;
-        case '\r':
-            out << "\\r";
-            break;
-        case '"':
-            out << "\\\"";
-            break;
-        case '\\':
-            out << "\\\\";
-            break;
-        default:
-            if (character >= 0x20 && character < 0x7F) {
-                out << static_cast<char>(character);
-            } else {
-                // Print "\uXXXX" for control or non-ASCII characters.
-                out << "\\u";
-                out.width(4);
-                out.fill('0');
-                out.setf(std::ios_base::hex, std::ios_base::basefield);
-                out.setf(std::ios::uppercase);
-                out << character;
-            }
-            break;
-        }
-    }
-    return out << '"';
-}
-
-} // namespace WTF