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

Source/platform/geometry/FloatPointTest.cpp

Index: Source/platform/geometry/FloatPointTest.cpp
diff --git a/Source/platform/geometry/FloatPointTest.cpp b/Source/platform/geometry/FloatPointTest.cpp
index e7ff706ea52a4bf81ee4a9fa2830926adc767394..001c7a6ec7dcf732c244f6315522aa64be160d7a 100644
--- a/Source/platform/geometry/FloatPointTest.cpp
+++ b/Source/platform/geometry/FloatPointTest.cpp
@@ -6,12 +6,9 @@
 #include "platform/geometry/FloatPoint.h"
 
 #include "platform/geometry/GeometryTestHelpers.h"
-
 #include <gtest/gtest.h>
 
-using namespace blink;
-
-namespace {
+namespace blink {
 
 TEST(FloatPointTest, LengthTest)
 {
@@ -31,4 +28,4 @@ TEST(FloatPointTest, LengthTest)
     EXPECT_PRED_FORMAT2(GeometryTest::AssertAlmostEqual, p4.length(), .707106781186548e20f);
 }
 
-}
+} // namespace blink