Fix unit test style in Source/wtf/.

Source/wtf/CheckedArithmeticTest.cpp

Index: Source/wtf/CheckedArithmeticTest.cpp
diff --git a/Source/wtf/CheckedArithmeticTest.cpp b/Source/wtf/CheckedArithmeticTest.cpp
index 650e3ac29c5284b859ae7b1b01673adceb2ccf67..d10572e88cf68b46180fcc9f47767d2f89ad66ae 100644
--- a/Source/wtf/CheckedArithmeticTest.cpp
+++ b/Source/wtf/CheckedArithmeticTest.cpp
@@ -24,14 +24,14 @@
  */
 
 #include "config.h"
-
 #include "wtf/CheckedArithmetic.h"
+
 #include <gtest/gtest.h>
 
-namespace {
+namespace WTF {
 
 #define CheckedArithmeticTest(type, coerceLiteral, MixedSignednessTest) \
-    TEST(WTF, Checked_##type) \
+    TEST(CheckedArithmeticTest, Checked_##type) \
     { \
         Checked<type, RecordOverflow> value; \
         EXPECT_EQ(coerceLiteral(0), value.unsafeGet()); \
@@ -148,4 +148,4 @@ CheckedArithmeticTest(uint32_t, CoerceLiteralToUnsigned, AllowMixedSignednessTes
 CheckedArithmeticTest(int64_t, CoerceLiteralNop, IgnoreMixedSignednessTest)
 CheckedArithmeticTest(uint64_t, CoerceLiteralToUnsigned, IgnoreMixedSignednessTest)
 
-} // namespace
+} // namespace WTF