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

Source/platform/text/LocaleMacTest.cpp

Index: Source/platform/text/LocaleMacTest.cpp
diff --git a/Source/platform/text/LocaleMacTest.cpp b/Source/platform/text/LocaleMacTest.cpp
index 139133996e542adc51533477c7060a34a7cbe8ac..ca9d09677f9fc22cf6505e999ca1d4912e15db8d 100644
--- a/Source/platform/text/LocaleMacTest.cpp
+++ b/Source/platform/text/LocaleMacTest.cpp
@@ -35,7 +35,7 @@
 #include "wtf/text/CString.h"
 #include <gtest/gtest.h>
 
-using namespace blink;
+namespace blink {
 
 class LocalePlatformSupport : public TestingPlatformSupport {
 public:
@@ -399,3 +399,5 @@ TEST_F(LocaleMacTest, localizedNumberRoundTrip)
     testNumbers("zh_HK");
     testNumbers("zh_TW");
 }
+
+} // namespace blink