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

Source/core/html/HTMLFormControlElementTest.cpp

Index: Source/core/html/HTMLFormControlElementTest.cpp
diff --git a/Source/core/html/HTMLFormControlElementTest.cpp b/Source/core/html/HTMLFormControlElementTest.cpp
index 9ead1126efde49ae0cf99970c369c4b49137a388..448412e3a97aaf2ce5d5173efa0a47f408893f6d 100644
--- a/Source/core/html/HTMLFormControlElementTest.cpp
+++ b/Source/core/html/HTMLFormControlElementTest.cpp
@@ -17,7 +17,7 @@ namespace blink {
 
 class HTMLFormControlElementTest : public ::testing::Test {
 protected:
-    virtual void SetUp() override;
+    void SetUp() override;
 
     DummyPageHolder& page() const { return *m_dummyPageHolder; }
     HTMLDocument& document() const { return *m_document; }
@@ -67,4 +67,4 @@ TEST_F(HTMLFormControlElementTest, customValidationMessageTextDirection)
     EXPECT_EQ(RTL, subMessageDir);
 }
 
-}
+} // namespace blink