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

Source/core/dom/ActiveDOMObjectTest.cpp

 /*
  * Copyright (c) 2014, 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
@@ skipping 17 matching lines @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #include "config.h"
 
 #include "core/dom/Document.h"
 #include "core/testing/DummyPageHolder.h"
 #include <gmock/gmock.h>
 #include <gtest/gtest.h>
 
-using namespace blink;
-
-namespace {
+namespace blink {
 
 class MockActiveDOMObject final : public GarbageCollectedFinalized<MockActiveDOMObject>, public ActiveDOMObject {
     WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(MockActiveDOMObject);
 public:
     explicit MockActiveDOMObject(ExecutionContext* context) : ActiveDOMObject(context) { }
 
     DEFINE_INLINE_VIRTUAL_TRACE()
     {
         ActiveDOMObject::trace(visitor);
     }
@@ skipping 52 matching lines @@
 }
 
 TEST_F(ActiveDOMObjectTest, MoveToStoppedDocument)
 {
     destDocument().detach();
 
     EXPECT_CALL(activeDOMObject(), stop());
     activeDOMObject().didMoveToNewExecutionContext(&destDocument());
 }
 
-} // unnamed namespace
+} // namespace blink