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

Source/platform/graphics/filters/FilterOperationsTest.cpp

Index: Source/platform/graphics/filters/FilterOperationsTest.cpp
diff --git a/Source/platform/graphics/filters/FilterOperationsTest.cpp b/Source/platform/graphics/filters/FilterOperationsTest.cpp
index e0aba19d47b3c7c53fde1c1c61b3a514bd32b651..ecb74cc52a1cf5c90a65be38b00c51b774e61478 100644
--- a/Source/platform/graphics/filters/FilterOperationsTest.cpp
+++ b/Source/platform/graphics/filters/FilterOperationsTest.cpp
@@ -28,9 +28,7 @@
 
 #include <gtest/gtest.h>
 
-using namespace blink;
-
-namespace {
+namespace blink {
 
 TEST(FilterOperationsTest, getOutsetsBlur)
 {
@@ -56,5 +54,4 @@ TEST(FilterOperationsTest, getOutsetsDropShadow)
     EXPECT_EQ(54, outsets.left());
 }
 
-}
-
+} // namespace blink