Merge base unit tests into src to be in line with Chrome.

src/base/platform/platform-unittest.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/base/platform/platform.h"
 
 #if V8_OS_POSIX
 #include <unistd.h>  // NOLINT
 #endif
 
@@ skipping 18 matching lines @@
 
 
 namespace {
 
 class SelfJoinThread V8_FINAL : public Thread {
  public:
   SelfJoinThread() : Thread(Options("SelfJoinThread")) {}
   virtual void Run() V8_OVERRIDE { Join(); }
 };
 
-}
+}  // namespace
 
 
 TEST(Thread, SelfJoin) {
   SelfJoinThread thread;
   thread.Start();
   thread.Join();
 }
 
 
 namespace {
@@ skipping 40 matching lines @@
   }
 
  private:
   static void* GetValue(size_t x) {
     return reinterpret_cast<void*>(static_cast<uintptr_t>(x + 1));
   }
 
   Thread::LocalStorageKey keys_[256];
 };
 
-}
+}  // namespace
 
 
 TEST_F(ThreadLocalStorageTest, DoTest) {
   Run();
   Start();
   Join();
 }
 
 }  // namespace base
 }  // namespace v8