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

Source/core/dom/DocumentTest.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 22 matching lines @@
 
 #include "core/frame/FrameView.h"
 #include "core/html/HTMLHeadElement.h"
 #include "core/html/HTMLLinkElement.h"
 #include "core/testing/DummyPageHolder.h"
 #include "platform/heap/Handle.h"
 #include "platform/weborigin/ReferrerPolicy.h"
 #include <gmock/gmock.h>
 #include <gtest/gtest.h>
 
-using namespace blink;
-
-namespace {
+namespace blink {
 
 class DocumentTest : public ::testing::Test {
 protected:
-    virtual void SetUp() override;
+    void SetUp() override;
 
 #if ENABLE(OILPAN)
-    virtual void TearDown() override
+    void TearDown() override
     {
         Heap::collectAllGarbage();
     }
 #endif
 
     Document& document() const { return m_dummyPageHolder->document(); }
     Page& page() const { return m_dummyPageHolder->page(); }
 
     void setHtmlInnerHTML(const char*);
 
@@ skipping 15 matching lines @@
 class MockDocumentVisibilityObserver
     : public NoBaseWillBeGarbageCollectedFinalized<MockDocumentVisibilityObserver>
     , public DocumentVisibilityObserver {
     WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(MockDocumentVisibilityObserver);
 public:
     static PassOwnPtrWillBeRawPtr<MockDocumentVisibilityObserver> create(Document& document)
     {
         return adoptPtrWillBeNoop(new MockDocumentVisibilityObserver(document));
     }
 
-    DEFINE_INLINE_VIRTUAL_TRACE() { }
+    DEFINE_INLINE_VIRTUAL_TRACE()
+    {
+        DocumentVisibilityObserver::trace(visitor);
+    }
 
     MOCK_METHOD1(didChangeVisibilityState, void(PageVisibilityState));
 
 private:
     MockDocumentVisibilityObserver(Document& document) : DocumentVisibilityObserver(document) { }
 };
 
 TEST_F(DocumentTest, VisibilityOberver)
 {
     page().setVisibilityState(PageVisibilityStateVisible, true); // initial state
@@ skipping 248 matching lines @@
     };
 
     for (auto test : tests) {
         document().setReferrerPolicy(ReferrerPolicyDefault);
 
         document().processReferrerPolicy(test.policy);
         EXPECT_EQ(test.expected, document().referrerPolicy()) << test.policy;
     }
 }
 
-} // unnamed namespace
+} // namespace blink