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

Source/platform/SharedBufferTest.cpp

Index: Source/platform/SharedBufferTest.cpp
diff --git a/Source/platform/SharedBufferTest.cpp b/Source/platform/SharedBufferTest.cpp
index f376ca5eb02dae16b86c3d1c87991928a4ebd966..80fdc9b9e32d8aefb9cfafb347422721a33b1f08 100644
--- a/Source/platform/SharedBufferTest.cpp
+++ b/Source/platform/SharedBufferTest.cpp
@@ -39,9 +39,7 @@
 #include <cstdlib>
 #include <gtest/gtest.h>
 
-using namespace blink;
-
-namespace {
+namespace blink {
 
 TEST(SharedBufferTest, getAsBytes)
 {
@@ -155,4 +153,4 @@ TEST(SharedBufferTest, createPurgeable)
     ASSERT_EQ(0, memcmp(data, testData.data(), length));
 }
 
-} // namespace
+} // namespace blink