Fix unit test style in Source/platform/, part 2.

Source/platform/text/DateTimeFormatTest.cpp

Index: Source/platform/text/DateTimeFormatTest.cpp
diff --git a/Source/platform/text/DateTimeFormatTest.cpp b/Source/platform/text/DateTimeFormatTest.cpp
index a6db6f503ea305df93e37411227b762bd654fb75..9facc96b571147ca995b899bf63c12c0dd85afb4 100644
--- a/Source/platform/text/DateTimeFormatTest.cpp
+++ b/Source/platform/text/DateTimeFormatTest.cpp
@@ -31,11 +31,11 @@
 #include "wtf/text/StringBuilder.h"
 #include <gtest/gtest.h>
 
-using namespace blink;
+namespace blink {
 
 class DateTimeFormatTest : public ::testing::Test {
 public:
-    typedef DateTimeFormat::FieldType FieldType;
+    using FieldType = DateTimeFormat::FieldType;
 
     struct Token {
         String string;
@@ -183,7 +183,7 @@ protected:
 private:
     class TokenHandler : public DateTimeFormat::TokenHandler {
     public:
-        virtual ~TokenHandler() { }
+        ~TokenHandler() override { }
 
         FieldType fieldType(int index) const
         {
@@ -193,7 +193,7 @@ private:
         Tokens tokens() const { return Tokens(m_tokens); }
 
     private:
-        virtual void visitField(FieldType fieldType, int count) override
+        void visitField(FieldType fieldType, int count) override
         {
             m_tokens.append(Token(fieldType, count));
         }
@@ -334,4 +334,6 @@ TEST_F(DateTimeFormatTest, SingleUpperCaseInvalid)
     EXPECT_EQ(DateTimeFormat::FieldTypeInvalid, single('X'));
 }
 
+} // namespace blink
+
 #endif