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

Source/platform/PurgeableVectorTest.cpp

 /*
  * Copyright (C) 2014 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 16 matching lines @@
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #include "config.h"
 #include "platform/PurgeableVector.h"
 
 #include "platform/TestingPlatformSupport.h"
 #include "public/platform/WebDiscardableMemory.h"
 #include "wtf/Vector.h"
-
 #include <algorithm>
 #include <cstdlib>
-
 #include <gtest/gtest.h>
 
-using namespace blink;
-
-namespace {
+namespace blink {
 
 const size_t kTestSize = 32 * 1024;
 
 enum DiscardableMemorySupport {
     DontSupportDiscardableMemory,
     SupportDiscardableMemory,
 };
 
 class PurgeableVectorTestWithPlatformSupport : public testing::TestWithParam<DiscardableMemorySupport> {
 public:
@@ skipping 270 matching lines @@
 
     if (purgeableVector.lock())
         ASSERT_EQ(0, memcmp(purgeableVector.data(), testData.data(), testData.size()));
 }
 
 // Instantiates all the unit tests using the SharedBufferTestWithPlatformSupport fixture both with
 // and without discardable memory support.
 INSTANTIATE_TEST_CASE_P(testsWithPlatformSetUp, PurgeableVectorTestWithPlatformSupport,
     ::testing::Values(DontSupportDiscardableMemory, SupportDiscardableMemory));
 
-} // namespace
-
+} // namespace blink