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

src/debug-agent.h

 // Copyright 2006-2008 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 14 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.
 
 #ifndef V8_DEBUG_AGENT_H_
 #define V8_DEBUG_AGENT_H_
 
 #ifdef ENABLE_DEBUGGER_SUPPORT
 #include "../include/v8-debug.h"
 #include "platform.h"
 
-namespace v8 { namespace internal {
+namespace v8 {
+namespace internal {
 
 // Forward decelrations.
 class DebuggerAgentSession;
 
 
 // Debugger agent which starts a socket listener on the debugger port and
 // handles connection from a remote debugger.
 class DebuggerAgent: public Thread {
  public:
   explicit DebuggerAgent(const char* name, int port)
@@ skipping 70 matching lines @@
   static bool SendMessage(const Socket* conn,
                           const v8::Handle<v8::String> message);
   static int ReceiveAll(const Socket* conn, char* data, int len);
 };
 
 } }  // namespace v8::internal
 
 #endif  // ENABLE_DEBUGGER_SUPPORT
 
 #endif  // V8_DEBUG_AGENT_H_