Move libplatform files into v8::platform namespace

src/libplatform/default-platform.h

 // Copyright 2013 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.
 
 #ifndef V8_LIBPLATFORM_DEFAULT_PLATFORM_H_
 #define V8_LIBPLATFORM_DEFAULT_PLATFORM_H_
 
 #include <vector>
 
 #include "include/v8-platform.h"
 #include "src/base/macros.h"
 #include "src/base/platform/mutex.h"
 #include "src/libplatform/task-queue.h"
 
 namespace v8 {
-namespace internal {
+namespace platform {
 
 class TaskQueue;
 class Thread;
 class WorkerThread;
 
 class DefaultPlatform : public Platform {
  public:
   DefaultPlatform();
   virtual ~DefaultPlatform();
 
@@ skipping 13 matching lines @@
   base::Mutex lock_;
   bool initialized_;
   int thread_pool_size_;
   std::vector<WorkerThread*> thread_pool_;
   TaskQueue queue_;
 
   DISALLOW_COPY_AND_ASSIGN(DefaultPlatform);
 };
 
 
-} }  // namespace v8::internal
+} }  // namespace v8::platform
 
 
 #endif  // V8_LIBPLATFORM_DEFAULT_PLATFORM_H_