Various extension-related cleanup and simplifications.

test/cctest/profiler-extension.h

 // Copyright 2013 the V8 project authors. All rights reserved.
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 // modification, are permitted provided that the following conditions are
 // met:
 //
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 //       notice, this list of conditions and the following disclaimer.
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 //       with the distribution.
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 //       from this software without specific prior written permission.
 //
 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 //
 // Tests of profiles generator and utilities.
 
+#ifndef V8_TEST_CCTEST_PROFILER_EXTENSION_H_
+#define V8_TEST_CCTEST_PROFILER_EXTENSION_H_
+
 #include "../include/v8-profiler.h"
 
+namespace v8 {
+namespace internal {
+
 class ProfilerExtension : public v8::Extension {
  public:
   ProfilerExtension() : v8::Extension("v8/profiler", kSource) { }
   virtual v8::Handle<v8::FunctionTemplate> GetNativeFunctionTemplate(
       v8::Isolate* isolate,
       v8::Handle<v8::String> name);
   static void StartProfiling(const v8::FunctionCallbackInfo<v8::Value>& args);
   static void StopProfiling(const v8::FunctionCallbackInfo<v8::Value>& args);
   static const v8::CpuProfile* last_profile;
  private:
   static const char* kSource;
 };
+
+
+} }  // namespace v8::internal
+
+#endif