Fix unit test style in core/{dom,editing,html}/.

Source/core/html/parser/HTMLParserThreadTest.cpp

 // Copyright 2014 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 "config.h"
 #include "core/html/parser/HTMLParserThread.h"
 
 #include <gtest/gtest.h>
 
-namespace {
+namespace blink {
 
-using namespace blink;
-
-TEST(HTMLParserThread, Init)
+TEST(HTMLParserThreadTest, Init)
 {
     // The harness has already run init() for us, so tear down the parser first.
     ASSERT_TRUE(HTMLParserThread::shared());
     HTMLParserThread::shutdown();
 
     // Make sure starting the parser thread brings it back to life.
     ASSERT_FALSE(HTMLParserThread::shared());
     HTMLParserThread::init();
     ASSERT_TRUE(HTMLParserThread::shared());
 }
 
-} // namespace
+} // namespace blink