Split BrowserThread into public API and private implementation, step 1.

content/test/test_browser_thread.cc

Index: content/test/test_browser_thread.cc
diff --git a/content/test/test_browser_thread.cc b/content/test/test_browser_thread.cc
new file mode 100644
index 0000000000000000000000000000000000000000..002a93fd3e5429c8841c553e17ff03b0a5d1ced7
--- /dev/null
+++ b/content/test/test_browser_thread.cc
@@ -0,0 +1,20 @@
+// Copyright (c) 2011 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.
+
+#include "content/test/test_browser_thread.h"
+
+namespace content {
+
+TestBrowserThread::TestBrowserThread(ID identifier)
+    : BrowserThreadImpl(identifier) {
+}
+
+TestBrowserThread::TestBrowserThread(ID identifier, MessageLoop* message_loop)
+    : BrowserThreadImpl(identifier, message_loop) {
+}
+
+TestBrowserThread::~TestBrowserThread() {
+}
+
+}  // namespace content