Fix unit test style in Source/platform/, part 1.

Source/platform/geometry/FloatBoxTest.cpp

Index: Source/platform/geometry/FloatBoxTest.cpp
diff --git a/Source/platform/geometry/FloatBoxTest.cpp b/Source/platform/geometry/FloatBoxTest.cpp
index f405f820e12e16d2f357c0cd7aa9eb5d2f1d40c7..1d8ef64bf1913dac5b01f0f6abd25df9a73c6fb6 100644
--- a/Source/platform/geometry/FloatBoxTest.cpp
+++ b/Source/platform/geometry/FloatBoxTest.cpp
@@ -26,12 +26,9 @@
 #include "platform/geometry/FloatBox.h"
 
 #include "platform/geometry/FloatBoxTestHelpers.h"
-
 #include <gtest/gtest.h>
 
-using namespace blink;
-
-namespace {
+namespace blink {
 
 TEST(FloatBoxTest, SimpleCreationTest)
 {
@@ -118,4 +115,4 @@ TEST(FloatBoxTest, EmptyBoxTest)
     EXPECT_FALSE(box.isEmpty());
 }
 
-}
+} // namespace blink