Split nested namespaces declaration in two lines in accordance with C++ Style Guide.

src/oprofile-agent.h

 // Copyright 2006-2009 the V8 project authors. 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
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 21 matching lines @@
 
 #include "globals.h"
 
 #ifdef ENABLE_OPROFILE_AGENT
 // opagent.h uses uint64_t type, which can be missing in
 // system headers (they have __uint64_t), but is defined
 // in V8's headers.
 #include <opagent.h>  // NOLINT
 #endif
 
-namespace v8 { namespace internal {
+namespace v8 {
+namespace internal {
 
 class OProfileAgent {
  public:
   static bool Initialize();
   static void TearDown();
   static void CreateNativeCodeRegion(const char* name,
                                      const void* ptr, unsigned int size);
   static void CreateNativeCodeRegion(String* name,
                                      const void* ptr, unsigned int size);
   static void CreateNativeCodeRegion(String* name, String* source, int line_num,
                                      const void* ptr, unsigned int size);
 #ifdef ENABLE_OPROFILE_AGENT
   static bool is_enabled() { return handle_ != NULL; }
 
  private:
   static op_agent_t handle_;
 
   // Size of the buffer that is used for composing code areas names.
   static const int kFormattingBufSize = 256;
 #else
   static bool is_enabled() { return false; }
 #endif
 };
 } }
 
 #endif  // V8_OPROFILE_AGENT_H_