Revert of Migrate TestCommon to Chromium c++ style and remove un-used header.

content/shell/renderer/test_runner/TestCommon.h

Index: content/shell/renderer/test_runner/TestCommon.h
diff --git a/content/shell/renderer/test_runner/TestCommon.h b/content/shell/renderer/test_runner/TestCommon.h
new file mode 100644
index 0000000000000000000000000000000000000000..7144158c3320758bd7daff6f5bf3eee8c961035e
--- /dev/null
+++ b/content/shell/renderer/test_runner/TestCommon.h
@@ -0,0 +1,27 @@
+// Copyright 2013 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef CONTENT_SHELL_RENDERER_TEST_RUNNER_TESTCOMMON_H_
+#define CONTENT_SHELL_RENDERER_TEST_RUNNER_TESTCOMMON_H_
+
+#include <stdio.h>
+#include <string>
+
+#include "base/compiler_specific.h"
+
+#if defined(WIN32)
+#define snprintf(str, size, ...) _snprintf_s(str, size, size, __VA_ARGS__)
+#endif
+
+namespace content {
+
+inline bool isASCIIAlpha(char ch) { return (ch | 0x20) >= 'a' && (ch | 0x20) <= 'z'; }
+
+inline bool isNotASCIIAlpha(char ch) { return !isASCIIAlpha(ch); }
+
+std::string normalizeLayoutTestURL(const std::string& url);
+
+}  // namespace content
+
+#endif  // CONTENT_SHELL_RENDERER_TEST_RUNNER_TESTCOMMON_H_